IIC 功能使用方法
IIC 功能使用方法
1
适用产品：
1.1 SM59R16A2/ SM59R08A2
1.2 SM59R16A5/ SM59R09A5/ SM59R05A5/ SM59R16A3/ SM59R09A3/ SM59R05A3
1.3 SM59R04A2/ SM59R04A1/ SM59R03A1/ SM59R02A1
2
IIC 使用概述：
2.1 使用硬件 SCL (clock)及 SDA (data) 两条线，必须接拉升电阻。
2.2 速度：SCL 最高可达 400Kbps(由软件设定 SFR IICBR[2:0])。
2.3 IIC 可选择 master 或 slave 两种模式。
2.4 提供中断(RXIF, TXIF)及两组控制地址使用。
2.5 由软件设定，Master 硬件可自动产生 IIC 的启动(START)、重新启动(Re-START)及停止(STOP)
信号；Slave 硬件可侦测 IIC 的 START、Re-START 及 STOP 信号。
2.6 Slave 最多可接 127 devices，线材电容量最高限制为 400pF。
3
P4IIC (IIC function pin assignment)说明：
P4IIC
(SPI function pin assignment)
SM59R16A5
○
SM59R09A5
○
SM59R05A5
○
SM59R16A3
○
SM59R09A3
○
SM59R05A3
○
SM59R16A2
×
SM59R08A2
×
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
SM59R04A2
○
SM59R04A1
○
SM59R03A1
○
SM59R02A1
○
○：表示该型号可以使用 P4IIC 功能
×：表示该型号不可使用 P4IIC 功能
Notice：所有系列 Package type DIP-40 皆没有 P4，所以没有用此功能
P4IIC (IIC function pin assign)说明
内建IIC，可直接经由软件设定将其脚位指定至P1或P4，避免和其它特殊功能脚位重复，
并提高硬件规划的兼容性。
Mnemonic
AUX
Description
Direct
Bit 7
Auxiliary register
91h
BRS
Bit 6
Bit 5
Bit 4
Serial interface 0 and 1
P4CC
P4SPI P4UR1
Bit 3
Bit 2
Bit 1
Bit 0
RESET
P4IIC
P0KBI
-
DPS
00H
Bit 4
Bit 3
Bit 2
MSS
MAS
RStart
TXIF
RDR
TDR
P4IIC: P4IIC = 0 – IIC function on P1.
P4IIC = 1 – IIC function on P4.
P4IIC
0
1
4
IIC_SCL
P1.6
P4.0
IIC_SDA
P1.7
P4.1
IIC 相关的特殊缓存器 SPI Special Function Register (SFR)
Mnemonic
Description
Direct
Bit 7
Bit 6
Bit 5
Bit 1
Bit 0
RESET
IIC function
IICCTL
IIC control register
F9h
IICEN
IICS
IIC status register
F8h
MStart
IICA1
IIC Address 1
register
FAh
IICA2
IIC Address 2
register
FBh
IICRWD
IIC Read/Write
register
FCh
IIC status2 register
FDh
IICS2
BF
RXIF
IICBR[2:0]
RXAK
TXAK
04H
RW
00H
IICA1[7:1]
MATCH1
or RW1
A0H
IICA2[7:1]
MATCH2
or RW2
60H
IICRWD[7:0]
-
Mnemonic: IICCTL
7
6
5
IICEN
----BF
MSS
-
4
MAS
-
3
RStart
-
2
AB_EN
1
IICBR[2:0]
00H
BF_EN
AB_F
BF
Address: F9h
0
Reset
04h
IICEN: IC 致能位(Enable IIC module)
IICEN = 1，IIC 致能。
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
00H
IIC 功能使用方法
IICEN = 0，IIC 禁能。
BF: (only SM59R16A2/SM59R08A2 used)
IC 传送失败旗标 Bus failed flag (used in master mode only)：
当 Master 传送数据”1”至 SDA，但 Master 侦测 SDA 为”0”时，此旗标将被硬件设置为”1” 。
此旗标可由软件清除。
MSS: 主从模式选择位 Master or slave mode select：
MSS = 1，设定为 master mode。
MSS = 0，设定为 slave mode。
*要使用 IIC，在设定其它 IIC SFR 时，程序必须最先致能此位。
MAS: 控制地址位 Master address select (master mode only)：
MAS = 0 ，选择控制地址(control byte)由 SFR IICA1 送出。
MAS = 1 ，选择控制地址(control byte)由 SFR IICA2 送出。
RStart: 重新启动位 Re-start control bit (master mode only)：
RStart = 0，在送出控制地址后旗标由硬件清除为”0” 。
RStart = 1，由软件设定，在收到 ACK 后，送出启动条件(Start condition)及控制地址
(控制地址位由 MAS)。
IICBR[2:0]: IIC 鲍率选择元位 Baud rate selection (master mode only)：
系统频率(Fosc)依据 MCU 外部晶振(或内部晶振)而定，默认值为 Fosc/512 。
IICBR[2:0]
000
001
010
011
100
101
110
111
Mnemonic: IICS
7
6
MStart
RxIF
Baud rate
Fosc/32
Fosc/64
Fosc/128
Fosc/256
Fosc/512
Fosc/1024
Fosc/2048
Fosc/4096
5
TxIF
4
RDR
3
TDR
2
RxAK
1
TxAK
Address: F8h
0
Reset
RW
00h
MStart: 启动位 Master start control bit (master mode only)
MStart = 1，由软件设置为”1”，送出启动条件(Start condition)及控制地址位(控制地址位
由 MAS)。
MStart = 0，由软件清除为”0”，送出停止条件(Stop condition)。
RxIF: 数据接收中断旗标 Data receive interrupt flag
Specifications subject to change without notice, contact your sales representatives for the most recent information.
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Ver A 2010/09
IIC 功能使用方法
Slave 由此旗标可判断资料是否已接收
RxIF = 1，当数据读写缓存器(IICRWD)加载数据完成时，由硬件设为”1”。
RxIF = 0，接收完成后必须由软件清除。
TxIF: 数据传送中断旗标 Data transmit interrupt flag
Master 由此旗标可判断资料是否已传出
TxIF = 1，当数据已由数据读写缓存器(IICRWD)载至位移缓存器，并已由位移缓存器传送
时，TxIF 为”1”
TxIF = 0，传送数据完成后必须由软件清除。
RDR: 数据接收完成位 Read data ready
RDR = 1，IIC module 接收数据至数据读写缓存器(IICRWD)时，由硬件自动设定为”1” 。
RDR = 0，当数据读写缓存器(IICRWD)完成接收后，必须由软件清除为”0”；当 RDR = 0
时，IIC module 才可再次写入新的数据至数据读写缓存器(IICRWD)。
TDR: 数据传送完成位 Transmit data ready
TDR = 1，由程序将数据写入数据读写缓存器(IICRWD)后，由软件设定此旗标为”1” ，告
知硬件 IIC module 将数据传出。
TDR = 0，当IIC module由数据读写缓存器(IICRWD)读取数据并完成传送时，此位则由硬
件自动清除。
RxAK: 接收应答位 Receive acknowledgement
当 IIC module 传送数据时此位为只读位，等待接收端回复应答(ACK/NACK)，不可由程序
编写。
当 IIC module 为 master mode：传出数据(8-bit)后，由 slave 回复应答位(RxAK)。
当 IIC module 为 slave mode：传出数据(8-bit)后，由 master 回复应答位(RxAK)。
TxAK: 传送应答位 Transmit acknowledgement
IIC module 当接收端时，接收数据完成后，回复传送端应答位(ACK/NACK)。
RW: Slave mode read or write(read only)
1. 当 IIC module 为 slave mode 时，此位为只读，不可由程序编写。
2. 此位由 master 的地址 IICA1(或 IICA2) 的 8th-bit 所控制：
= 0 : master 要求 slave 的 IIC module 为接收模式(即 master write, slave read)。
= 1 : master 要求 slave 的 IIC module 为传送模式(即 master read, slave write)。
Fig. Acknowledgement bit in the 9th bit of a byte transmission
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
Mnemonic: IICA1
7
6
5
4
IICA1[7:1]
R/W
3
2
1
Address: FAH
Reset
0
Match1 or RW1 A0H
R or R/W
Slave mode:
IICA1[7:1]: IIC Address registers
第一组控制地址 IICA1 共 7-bit，由软件设定，当 slave 接收到 master 的启动条件(Start condition)，
及控制地址(IICA1)7-bit，两者会相互比对，比较结果可参考 Match1。
Match1: = 1，当 slave 硬件侦测到启动条件(Start condition)，且控制地址(IICA1)7-bit 相同时，slave 的
8th-bit(Match1)会由硬件设置为”1” 。
= 0，当 slave 硬件(1) RXIF 发生但未侦测到启动条件(Start condition)，或(2)TXIF 发生时，Match1
由硬件清除为”0”。
Master mode:
IICA1[7:1]: IIC Address registers
1. 第一组控制地址 IICA1 共 7-bit，由软件设定。
2. 当 MAS = 0，选择控制地址(IICA1)。
(当 MAS = 1，选择控制地址(IICA2)。)
3. 当 MStart 由软件设置为”1”时，会送出启动条件(Start condition)及控制地址位(IICA1)。
RW1: 当 master 与 slave 的控制地址 7-bit 相同时，master 送出 8th-bit(R／W-bit)，告知 slave 读写的状
态
RW1= 1：为 master IIC module 接收模式(即 master read, slave write)。
RW1= 0：为 master IIC module 传送模式(即 master write, slave read)。
Fig. : RW bit in the 8th bit after IIC address
Mnemonic: IICA2
7
6
5
Address: FBh
4
IICA2[7:1]
R/W
3
2
1
0
Match2 or RW2
R or R/W
Reset
60h
Slave mode:
IICA2[7:1]: IIC Address registers
第二组控制地址 IICA2 共 7-bit，由软件设定，当 slave 接收到 master 的启动条件(Start condition)，
及控制地址(IICA2)7-bit，两者会相互比对，比较结果可参考 Match2。
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
Match2: = 1，当 slave 硬件侦测到启动条件(Start condition)，且控制地址(IICA2)7-bit 相同时，slave 的
8th-bit(Match2)会由硬件设置为”1” 。
= 0，当 slave 硬件(1) RXIF 发生但未侦测到启动条件(Start condition)，或(2)TXIF 发生时，Match2
由硬件清除为”0”。
Master mode:
IICA2[7:1]: IIC Address registers
1. 第二组控制地址 IICA2 共 7-bit，由软件设定。
2. 当 MAS = 1，选择控制地址位(IICA2)。
(当 MAS = 0，选择控制地址位(IICA1)。)
3. 当 MStart 由软件设置为”1”时，会送出启动条件(Start condition)及控制地址位(IICA2)。
RW2: 当 master 与 slave 的控制地址 7-bit 相同时，master 送出 8th-bit(R／W-bit)，告知 slave 读写的状
态
RW1= 1：为 master IIC module 接收模式(即 master read, slave write)。
RW1= 0：为 master IIC module 传送模式(即 master write, slave read)。
Mnemonic: IICRWD
7
6
5
4
3
IICRWD[7:0]
2
Address: FCh
0
Reset
00h
1
IICRWD[7:0]: IIC 数据读写缓存器(8-bit) IIC read write data buffer：
IIC module 为接收模式(读取)时，为接收数据的暂存区。
IIC module 为传送模式(写入)时，为传送数据的暂存区。
The IICS2 register only SM59R16A5/SM59R09A5/SM59R05A5/SM59R16A3/SM59R09A3/SM59R05A3 and
SM59R04A2/SM59R04A1/SM59R03A1/SM59R02A1 used.
Mnemonic: IICS2
Address: FDH
7
6
5
4
-
-
-
-
3
AB_EN
2
1
0
Reset
BF_EN
AB_F
BF
00H
AB_EN: 仲裁失去了致能位. (仅主机模式)Arbitration lost enable bit. (Master mode only)
=1，致能，master硬件将检查仲裁丢失位AB_F，一旦发生丢失仲裁，AB_F将被设置为”1”，
即返回到闲置状态。
=0，禁能，master硬件不会理会仲裁丢失情况。
当系统为多主从(multi-master)应用时，请致能该侦测位(AB_EN)。
当系统为单主从(single-master)应用时，可禁能该侦测位(AB_EN)。
BF_EN: 总线忙碌侦测致能位 Bus busy enable bit. (Master mode only)
=1，致能，master硬件无法送出启动条件(Start condition)，直到BF=0。
=0，禁能，master硬件不理会BF=0或1。
当系统为多主从(multi-master)应用时，请致能该侦测位(BF_EN)。
当系统为单主从(single-master)应用时，可禁能该侦测位(BF_EN)。
AB_F: 仲裁丢失位(仅主机模式) Arbitration lost bit. (Master mode only)
=1，当master SDA送出”1”却侦测回应为”0”时，即发生丢失仲裁，AB_F将被设置为”1”。 系
统为多主从(multi-master)应用，通讯时请侦测该位。
=0，在重送数据前软件需清除此位，且需检查BF直到已清除为”0”。
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
BF: 总线忙碌侦测位 Bus busy bit. (Master mode only)
=1，当Master侦测到BUS上有SCL=0或SDA＝0或启动条件(Start condition)时，该BF由硬
件设为”1”。系统为多主从(multi-master)应用，通讯时请侦测该位。
=0，当Master侦测到停止条件(Stop condition)，大约4.7us后，BF由硬件清除为”0”。此位
也可由软件清除为”0”，使总线回到初始状态。
5
IIC 中断
5.1 向量表(Interrupt vectors table)
Interrupt Vector
Address
Interrupt Number
*(use Keil C Tool)
IE0 – External interrupt 0
0003h
0
TF0 – Timer 0 interrupt
000Bh
1
IE1 – External interrupt 1
0013h
2
TF1 – Timer 1 interrupt
001Bh
3
RI0/TI0 – Serial channel 0 interrupt
0023h
4
TF2/EXF2 – Timer 2 interrupt
002Bh
5
PWMIF – PWM interrupt
(The SM59R16A2/SM59R08A2 haven’t)
0043h
8
SPIIF – SPI interrupt
004Bh
9
ADCIF – A/D converter interrupt
0053h
10
KBIIF – keyboard Interface interrupt
005Bh
11
LVIIF – Low Voltage Interrupt
(The SM59R16A2/SM59R08A2 haven’t)
0063h
12
IICIF – IIC interrupt
006Bh
13
RI1/TI1 – Serial channel 1 interrupt
0083h
16
008Bh
17
0093h
18
Interrupt Request Flags
RTC/ALARM interrupt
(Only SM59R16A5/SM59R09A5/SM59R05A5 have)
Comparator interrupt
(Only SM59R16A5/SM59R09A5/SM59R05A5 have)
*See Keil C about C51 User’s Guide about Interrupt Function description
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
5.2 中断相关缓存器(Interrupt SFR)
Mnemonic
Description
Direct
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RESET
Interrupt
IEN0
Interrupt Enable
0 register
A8h
EA
-
ET2
ES0
ET1
EX1
ET0
EX0
00h
IEN1
Interrupt Enable
1 register
B8h
EXEN2
-
IEIIC
-
IEEEI
IEADC
IESPI
-
00h
IEN2
Interrupt Enable
2 register
9Ah
-
-
-
-
-
-
-
ES1
00h
IP0
Interrupt priority
level 0
A9h
-
-
IP0.5
IP0.4
IP0.3
IP0.2
IP0.1
IP0.0
00h
IP1
Interrupt priority
level 1
B9h
-
-
IP1.5
IP1.4
IP1.3
IP1.2
IP1.1
IP1.0
00h
IIC 中断应用可参考以下设定：
(1) IIC 中断致能设定：
IEN0 |= 0x80;
//Enable interrupt All
IEN1 |= 0x20;
//Enable interrupt IIC
(2) IIC 中断程序表示：
void IIC_interrupt(void) interrupt 13
{
if(IICS_TXIF)
{
TxInt = 1;
IICS_TXIF = 0;//Clear interrupt flag
}
if(IICS_RXIF)
{
RxInt = 1;
IICS_RXIF = 0;//Clear interrupt flag
}
}
Ps. IIC 中断发生，必须清除 IICS^TXIF 或 IICS^RXIF，而非 IRCON 的 IICIF！
（中断应用可参考范例程序二）
6
MCU 为 master，EEPROM 为 slave 通讯应用的流程图(二)：
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
6.1 Demo Board(SDB0001B) 上 的 EEPROM 为 24LC04 (4KEEPROM ， 512x8bits ， 32pages ，
16bytes/page，详细规格书可上网下载)．
6.2 MCU 对 EEPROM 做 page write (256bytes = 16bytes x 16page)，再用 random read 做 data verify 确
认
7
MCU 对 EEPROM 24LC04 系列应用的范例程序(二)
Description
Main program
MCU master w/r IIC-EEPROM:
//===============================
//INCLUDE FILES
//===============================
#include "..\h\SM59R16A2.h"
#include "..\h\SM59R16A2_ExtraDef.h"
#include "..\LCD\LCD16x2.h"
#include "..\MISC\Delay.h"
//===============================
//DEFINITIONs
//===============================
#define IICSendStop()
IICS_MStart = false
#define NACK
1
#define ACK
0
#define Address_S
0x00
//for ICCEE verify
#define Address_E
0xFF
//for ICCEE verify
#define NC
0
//Don't care
//===============================
Specifications subject to change without notice, contact your sales representatives for the most recent information.
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Ver A 2010/09
IIC 功能使用方法
//GLOBAL VARIABLES
//===============================
bit
IICEE_Error = false ;
// This bit is used to indicate if the read/write
is successful.
// True/1: Error, False/0: No Error
bit TxInt = 0;
bit RxInt = 0;
unsigned int Count_OK=0, Count_Err=0;
unsigned char code EDID_Data[]=
{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
0x0C, 0x0D, 0x0E, 0x0F,
0X10, 0X11, 0X12, 0X13, 0X14, 0X15, 0X16, 0X17, 0X18, 0X19, 0X1A, 0X1B,
0X1C, 0X1D, 0X1E, 0X1F,
0X20, 0X21, 0X22, 0X23, 0X24, 0X25, 0X26, 0X27, 0X28, 0X29, 0X2A, 0X2B,
0X2C, 0X2D, 0X2E, 0X2F,
0X30, 0X31, 0X32, 0X33, 0X34, 0X35, 0X36, 0X37, 0X38, 0X39, 0X3A, 0X3B,
0X3C, 0X3D, 0X3E, 0X3F,
0X40, 0X41, 0X42, 0X43, 0X44, 0X45, 0X46, 0X47, 0X48, 0X49, 0X4A, 0X4B,
0X4C, 0X4D, 0X4E, 0X4F,
0X50, 0X51, 0X52, 0X53, 0X54, 0X55, 0X56, 0X57, 0X58, 0X59, 0X5A, 0X5B,
0X5C, 0X5D, 0X5E, 0X5F,
0X60, 0X61, 0X62, 0X63, 0X64, 0X65, 0X66, 0X67, 0X68, 0X69, 0X6A, 0X6B,
0X6C, 0X6D, 0X6E, 0X6F,
0X70, 0X71, 0X72, 0X73, 0X74, 0X75, 0X76, 0X77, 0X78, 0X79, 0X7A, 0X7B,
0X7C, 0X7D, 0X7E, 0X7F,
0X80, 0X81, 0X82, 0X83, 0X84, 0X85, 0X86, 0X87, 0X88, 0X89, 0X8A, 0X8B,
0X8C, 0X8D, 0X8E, 0X8F,
0X90, 0X91, 0X92, 0X93, 0X94, 0X95, 0X96, 0X97, 0X98, 0X99, 0X9A, 0X9B,
0X9C, 0X9D, 0X9E, 0X9F,
0XA0, 0XA1, 0XA2, 0XA3, 0XA4, 0XA5, 0XA6, 0XA7, 0XA8, 0XA9, 0XAA, 0XAB,
0XAC, 0XAD, 0XAE, 0XAF,
0XB0, 0XB1, 0XB2, 0XB3, 0XB4, 0XB5, 0XB6, 0XB7, 0XB8, 0XB9, 0XBA, 0XBB,
0XBC, 0XBD, 0XBE, 0XBF,
0XC0, 0XC1, 0XC2, 0XC3, 0XC4, 0XC5, 0XC6, 0XC7, 0XC8, 0XC9, 0XCA, 0XCB,
0XCC, 0XCD, 0XCE, 0XCF,
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB,
0xDC, 0xDD, 0xDE, 0xDF,
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB,
0xEC, 0xED, 0xEE, 0xEF,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB,
0xFC, 0xFD, 0xFE, 0xFF
};
//===============================================================
//OWNED SUBROUTINES
//===============================================================
void OSD(unsigned char SW, unsigned int D0, unsigned int D1)
{
switch( SW)
{
case 0:
PrintLcdStrLX(1, 0, "IIC demo:24xx EE");
break;
case 1:
PrintLcdStrLX(2, 0, "Writing...
");
SetCursorAddr(2, 13);
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ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
PrintLcdDec(D0);
break;
case 2:
PrintLcdStrLX(2,
Delay10mSec(50);
break;
case 3:
PrintLcdStrLX(1,
PrintLcdStrLX(1,
SetCursorAddr(1,
PrintLcdDec(D0);
break;
case 4:
PrintLcdStrLX(2,
SetCursorAddr(2,
PrintLcdDec(D0);
SetCursorAddr(2,
PrintLcdDec(D1);
Delay10mSec(50);
break;
case 5:
break;
case 6:
break;
case 7:
break;
case 8:
break;
case 9:
break;
case 10:
break;
default:
break;
0, "Done.
");
0, "Verifying...
12, "
");
13);
0, "OK:
3);
Er:
");
");
11);
}
}
void IIC_Init(unsigned char IICSetting)
{
IICCTL = IICSetting ;
}
void MCU_Init()
{
// IIC_Init(IIC_EN|IIC_MASTER|IIC_ADR_CA1|IIC_BR4096); // Init BR
IIC_Init(IIC_EN|IIC_MASTER|IIC_ADR_CA1|IIC_BR32);
// Init BR
IEN0 = 0x80;
//Enable interrupt All
IEN1 = 0x20;
//Enable interrupt IIC
}
void IICDisable(void)
{
IICCTL = 0x04 ;
}
// 0x04 is MCU reset value
//===============================================================
//This function will send out the START pulse and CONTROL byte.
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Ver A 2010/09
IIC 功能使用方法
//===============================================================
void IIC_SendStart(unsigned char ControlByte)
{
if( IICCTL & MSK_IICCTL_MAS )
IICA2
= ControlByte;
// MAS = 1
else
IICA1
= ControlByte;
// MAS = 0
IICS_MStart = true;
while(~TxInt);
TxInt = 0;
}
//===============================================================
//This function will send out the RESTART pulse and CONTROL byte.
//===============================================================
void IIC_SendRestart(unsigned char ControlByte)
{
if( IICCTL & MSK_IICCTL_MAS )
IICA2
= ControlByte;
// MAS = 1
else
IICA1
= ControlByte;
// MAS = 0
IICCTL |= IIC_RSTART;
while(~TxInt);
TxInt = 0;
}
//===============================================================
//This function will wait and receive one byte, then feedback ACK or NACK.
//===============================================================
unsigned char IIC_ReceiveByte(bit ACKStatus)
{
unsigned char
temp;
unsigned int
Counter = 0;
// Feedback ACK/NACK to slave for continue/stopping the transaction soon.
IICS_TXAK
= ACKStatus;
while(~RxInt);
RxInt = 0;
temp
= IICRWD;
IICS_RDR
= 0;
// Clear Read Data Ready bit
return(temp);
}
void IIC_TransmitByte(unsigned char TxData)
{
IICRWD = TxData;
IICS_TDR
= 1;
while(~TxInt);
TxInt = 0;
}
unsigned char IICEE_RandomRead(unsigned char Block, unsigned char Address)
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ISSFA-0192
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IIC 功能使用方法
{
unsigned char temp;
// -- Send CONTROL byte -IIC_SendStart( 0xA0|Block );
operation
// Set CONTROL byte to be write
// -- Send ADDRESS -IIC_TransmitByte(Address);
// -- Send CONTROL byte -IIC_SendRestart( 0xA1|Block );
operation.
// Set CONTROL byte to be read
// -- Read one byte -temp
= IIC_ReceiveByte(NACK);
// Wait for one byte
// -- Send STOP -IICSendStop();
return(temp);
}
void IICEE_ByteWrite(unsigned char Block, unsigned char Address, unsigned char
WriteData)
{
// -- Send CONTROL byte -IIC_SendStart( 0xA0|Block );
// Set CONTROL byte to be write
operation
// -- Send ADDRESS -IIC_TransmitByte(Address);
// -- Write one byte -IIC_TransmitByte(WriteData);
// -- Send STOP -IICSendStop();
}
void IICEE_Page_Write(unsigned char Block, unsigned char Page_sel )
{
unsigned int i=0;
unsigned int Address_Page_S=0;
Address_Page_S= Page_sel<<4;
// -- Send CONTROL byte -IIC_SendStart( 0xA0|Block );
// Set CONTROL byte to be write operation
// -- Send ADDRESS -IIC_TransmitByte( Address_Page_S ); Delay10mSec(1);
// -- Write N bytes -for (i=Address_Page_S; i<(Address_Page_S+16); i++) //16byte per 1page
{
OSD(1, EDID_Data[i], NC);
IIC_TransmitByte( EDID_Data[i]);
// Transmit one byte
Delay10mSec(1);
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IIC 功能使用方法
}
// -- Send STOP -IICSendStop();
}
void IICEE_Byte_Read()
{
unsigned int i, temp ;
for (i=Address_S; i<=Address_E; i++)
{
//PrintLcdDec(i);
temp = IICEE_RandomRead(0, i); //read
OSD(3, temp, NC);
P2 = temp;
if( temp == EDID_Data[i] )
//verify
Count_OK++;
else
{
Count_Err++;
}
Delay10mSec(1);
// For display stable.
}
OSD(4, Count_OK, Count_Err);
}
void IIC_interrupt(void) interrupt 13 using 1
{
if(IICS_TXIF)
{
TxInt = 1;
IICS_TXIF = 0;//Clear interrupt flag
}
if(IICS_RXIF)
{
RxInt = 1;
IICS_RXIF = 0;//Clear interrupt flag
}
}
void main()
{
unsigned char i=0;
P2 = 0x00;
MCU_Init();
LCD_Init();
Delay10mSec(5);
OSD(0, NC, NC);
// P2 is 7 Segment. for test only
//Init MCU
//Init LCD
//On screen display
for (i=0; i<=15; i++)
{
IICEE_Page_Write(0, i); //Block=0, page=0~15
}
OSD(2, NC, NC);
while(1)
{
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Ver A 2010/09
IIC 功能使用方法
IICEE_Byte_Read();
}
}
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ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
8
通讯协议以标准的 IIC EEPROM 24Cxx 为范例，Master 和 Slave 皆使用 SM59R16A5，示范 page write 及 random ead 之间如何沟通
及控制，以下是 Master 及 Slave 沟通时的缓存器状态及说明。
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ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
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Ver A 2010/09
IIC 功能使用方法
9
通讯协议以标准的 IIC EEPROM 24Cxx，使用 SM59R16A5 当 Master 和 Slave 的范例程序：
Description
Main program
-- MCU IIC master -1. 以下定义有注明”user modify”，是 user 可搭配 slave 自行变更修改，其它未注明的不建议修改。
2. 一般模式中，Device ID 应尽量避免使用 0xA0(EEPROM 常用)和 0x00(general call address 使用)，
或其它 IIC 规范中特定保留的部分。
3. 范例使用 IIC 数据存取最常使用的通讯协议，page write 及 random read，可直接与 slave 沟通。
//========================================================================
//
//
S Y N C M O S T E C H N O L O G Y
//
//========================================================================
//IIC Master sample code, "user modify" as fallow, that is allowed for
//modify. Others are not suggest or illegal.
//===============================
//INCLUDE FILES
//===============================
#include "SM59R16A5.h"
#include "IIC.h"
//===============================
//IIC DEFINITIONs
//===============================
#define d_IIC_EN
0x80
#define d_DEVICE_ID
0x50
//#define
d_DEVICE_ID
0xA0
//user modify
//user modify
#define d_IIC_MASTER
#define d_IIC_SLAVE
#define d_IIC_MODE_SEL
0x20
0x00
d_IIC_MASTER
//user modify
#define
#define
#define
#define
d_IIC_ADR_CA1
d_IIC_ADR_CA2
d_MSK_IICCTL_MAS
d_IIC_ADR_SEL
0x00
0x10
0x10
d_IIC_ADR_CA2
//user modify
#define
#define
#define
#define
#define
#define
#define
#define
#define
d_BR32
d_BR64
d_BR128
d_BR256
d_BR512
d_BR1024
d_BR2048
d_BR4096
d_IIC_BR
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
d_BR32
//user modify
#define d_NACK
1
#define d_ACK
0
#define d_WRITE
0
#define d_READ
1
#define IIC_Start()
MStart
= 1
#define IIC_Restart()
IICCTL |= 0x08
#define IIC_SendStop()
MStart
= 0
//===============================
//Code Data
//===============================
unsigned char code EDID_Data[]=
{
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
0x0C, 0x0D, 0x0E, 0x0F
};
//===============================================================
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ISSFA-0192
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IIC 功能使用方法
//OWNED SUBROUTINES
//===============================================================
void Delay10uSec(unsigned int NTime)
{
unsigned int
i, j;
for(i=0; i<NTime; i++)
for(j=0; j<18; j++);
}
void IIC_interrupt(void) interrupt d_IIC_Vector
{
if(TXIF)
{
TXIF = 0;
//Clear interrupt flag
}
if(RXIF)
{
}
}
void IIC_Init(unsigned char IICSetting)
{
IICA1
= 0x00;
IICA2
= 0x50;
IICCTL = IICSetting ;
IEN1
= 0x20;
// Enable interrupt IIC
IICS2
= 0x0C;
// Enable IIC AB_EN & BF_EN
}
void MCU_Init()
{
IFCON
|= 0x80;
// MCU 1T
IEN0
= 0x80;
// Enable interrupt All
IIC_Init(d_IIC_EN | d_IIC_MODE_SEL | d_IIC_ADR_SEL | d_IIC_BR); // Init
BR
}
void IIC_Disable(void)
{
IEN1
&= 0xDF;
IICCTL
= 0x00;
IICS
= 0x00;
IICS2
= 0x00;
}
// Disable interrupt IIC
// Disable IIC all function
// Clear IIC all status
// Clear IIC all status
//===============================================================
//This function will send out the START pulse and CONTROL byte.
//===============================================================
void IIC_SendStart(unsigned char ControlByte)
{
if( IICCTL & d_MSK_IICCTL_MAS )
IICA2
= ControlByte;
// MAS = 1
else
IICA1
= ControlByte;
// MAS = 0
while(TDR);
IIC_Start();
// wait last data trans. finish
// MStart
= 1
}
//===============================================================
//This function will send out the RESTART pulse and CONTROL byte.
//===============================================================
void IIC_SendRestart(unsigned char ControlByte)
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ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
{
while(TDR);
// wait last data trans. finish
if( IICCTL & d_MSK_IICCTL_MAS )
IICA2
= ControlByte;
// MAS = 1
else
IICA1
= ControlByte;
// MAS = 0
IIC_Restart();
// IICCTL
|= 0x08;
}
//===============================================================
//This function will wait and receive one byte, then feedback ACK or NACK.
//===============================================================
unsigned char IIC_ReceiveByte(bit ACKStatus)
{
unsigned char
temp;
TXAK
= ACKStatus;
// Feedback ACK/d_NACK to slave
while(~RXIF){};
RXIF=0;
temp
RDR
= IICRWD;
= 0;
// Clear Read Data Ready bit
return(temp);
}
void IIC_TransmitByte(unsigned char TxData)
{
while(TDR);
// wait last data trans. finish
IICRWD = TxData;
TDR = 1;
}
void IIC_Page_Write( char Crtl_byte, char Addr, char LEN)
{
unsigned char counter=0;
IIC_SendStart( Crtl_byte );
IIC_TransmitByte( Addr );
// -- Send CONTROL byte -// -- Send ADDRESS --
for (counter=0; counter<LEN; counter++)
// -- Write N bytes -{
IIC_TransmitByte( EDID_Data[Addr + counter]);// -- Transmit one byte
-}
while(TDR);
IIC_SendStop();
// must wait last data trans. finish
// -- Send STOP -- MStart= 0
}
void IIC_Random_Read( char Crtl_byte, char Addr, char LEN)
{
unsigned char Temp[16];
unsigned char counter=0;
IIC_SendStart( Crtl_byte | d_WRITE );
IIC_TransmitByte(Addr + counter);
// -- Send CONTROL byte -// -- Send ADDRESS --
IIC_SendRestart(Crtl_byte | d_READ);
for(counter=0; counter<LEN; counter++)
{
if(counter<(LEN-1))
{
// -- Send Restart -// -- Read N byte --
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ISSFA-0192
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IIC 功能使用方法
Temp[counter] = IIC_ReceiveByte(d_ACK); // Receive one byte
}
else
{
Temp[counter] = IIC_ReceiveByte(d_NACK);// Receive last byte
}
}
IIC_SendStop();
// -- Send STOP -- MStart= 0
}
void Check_Arbitration(void)
{
while(IICS2&0x02)
{
IICS2 &= 0xFD;
Delay10uSec(1);
}
}
// multi-master use
void Check_Busy(void)
{
while(IICS2&0x01)
{
IICS2 &= 0xFE;
Delay10uSec(1);
}
}
// multi-master use
void main()
{
MCU_Init();
Check_Arbitration();
Check_Busy();
// multi-master use
// multi-master use
IIC_Page_Write(d_DEVICE_ID, 0x00, 16);
IIC_Random_Read(d_DEVICE_ID, 0x00, 8);
IIC_Random_Read(d_DEVICE_ID, 0x08, 8);
Delay10uSec(10);
Delay10uSec(10);
Delay10uSec(10);
IIC_Disable();
while(1)
{
}
}
Description
Main program
-- MCU IIC Slave -//====================================================================
//
//
S Y N C M O S T E C H N O L O G Y
//
//====================================================================
#include "SM59R16A5.h"
//=====================================================================
#define d_IIC_Adress_1 0x50
//user modify
#define d_IIC_Adress_2 0x00
//user modify
#define
#define
#define
#define
#define
d_ACK
d_NACK
d_Write
d_Read
d_null
0
1
0
1
0x00
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ISSFA-0192
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IIC 功能使用方法
//=====================================================================
unsigned char n_RW
= d_null;
unsigned char n_Addr
= d_null;
unsigned char n_IIC_Step= d_null;
unsigned char n_DAT[16];
//=====================================================================
void IIC_interrupt(void) interrupt d_IIC_Vector
{
if((IICA1&0x01)|(IICA2&0x01))
{
n_IIC_Step = d_null;
}
// Device ID match, step clear
if(RXIF)
{
RXIF = 0;
RDR =0;
n_IIC_Step++;
switch (n_IIC_Step)
{
case 0:
break;
case 1:
// match
n_RW = RW;
break;
case 2:
// write addr
n_Addr = IICRWD;
break;
default:
// write data
n_DAT[n_Addr++] = IICRWD;
break;
}
}
else if(TXIF)
{
TXIF
= 0;
}
}
void IIC_init_slave(void)
{
IICCTL = 0x80;
IICS
= 0x00;
IRCON
= 0x00;
IICA1
= d_IIC_Adress_1;
IICA2
= d_IIC_Adress_2;
IEN0
|= 0x80;
IEN1
|= 0x20;
//Enable IIC module
//init IICS
//init IRCON
//Control Byte 1
//Control Byte 2
//Enable interrupt All
//Enable interrupt IIC
}
void main(void)
{
IIC_init_slave();
while(1)
{
//=====================================================================
if((n_RW==d_Read)&(n_IIC_Step>=1)) // slave TX start
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ISSFA-0192
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Ver A 2010/09
IIC 功能使用方法
{
if(RXAK == d_ACK)
{
IICRWD = n_DAT[n_Addr++];
TDR=1;
while(TDR){}
}
else if(RXAK == d_NACK)
{
n_IIC_Step = d_null;
n_RW
= d_null;
}
// trans. data if recive ACK
// End if recive NACK
}
//=====================================================================
}//end of while(1)
}//end of main
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ISSFA-0192
23
Ver A 2010/09