SM39R 系列 KBI 功能使用方法
SM39R 系列 KBI 功能使用方法
1
適用產品：
1.1 SM39R16A2/ SM39R12A2/ SM39R08A2
2
KBI 使用說明：
2.1 共有 4 個 I/O 可致能為 KBI 功能 I/O。
2.2 由 Port 0 共 4 個 I/O，分別對應至 4 個獨立的旗標(KBF.0~ KBF.3)，且共用同一個中斷向量位置
(0x5B)。
2.3 可由程式設定為高準位或低準位觸發。
2.4 當觸發訊號輸入至 KBI 任一引腳，其對應的旗標將會被設置為”1”，並且進入中斷副程式。
2.5 KBI 功能主要可做為 2x2 矩陣式鍵盤掃描，或其它應用。
KBI0
Input
circuitry
KBI1
Input
circuitry
KBI2
Input
circuitry
KBI3
Input
circuitry
OR
KBIIF: KBI interrupt flag
IEKBI: KBI interrupt enable
Fig. Interrupts from KBI 4 inputs
Fig. keyboard input circuitry
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
1
Ver. A 2010/08
SM39R 系列 KBI 功能使用方法
2.6 KBI 相關暫存器：
KBI
KBLS
KBE
KBF
KBD
IEN1
IRCON
Description
KBI level selection
KBI input enable
KBI flag
KBI De-bounce
control register
Interrupt Enable 1
register
Interrupt request
register
Mnemonic: KBLS
7
6
-
Direct
Bit 7
93h
94h
95h
-
96h
KBDEN
-
-
B8H
EXEN2
-
C0H
EXF2
TF2
5
-
Bit 6 Bit 5 Bit 4
KBI function
-
4
-
Bit 3
Bit 2
Bit 1
Bit 0
RESET
KBLS3
KBE3
KBF3
KBLS2
KBE2
KBF2
KBLS1
KBE1
KBF1
KBLS0
KBE0
KBF0
00H
00H
00H
-
-
-
KBD1
KBD0
00H
IEIIC
IELVI
IEKBI
IEADC
IESPI
IEPWM
00H
IICIF
LVIIF
KBIIF
ADCIF
SPIIF
PWMIF
00H
3
KBLS3
2
KBLS2
1
KBLS1
Address: 93h
0
Reset
KBLS0
00H
1
KBE1
Address: 94h
0
Reset
KBE0
00H
KBLS.3: 觸發準位設定位元 (Keyboard Line 3 level selection bit)
0 : 設定為低準位觸發
1 : 設定為高準位觸發
KBLS.2: 觸發準位設定位元 (Keyboard Line 2 level selection bit)
0 : 設定為低準位觸發
1 : 設定為高準位觸發
KBLS.1: 觸發準位設定位元 (Keyboard Line 1 level selection bit)
0 : 設定為低準位觸發
1 : 設定為高準位觸發
KBLS.0: 觸發準位設定位元 (Keyboard Line 0 level selection bit)
0 : 設定為低準位觸發
1 : 設定為高準位觸發
Mnemonic: KBE
7
6
-
5
-
4
-
3
KBE3
2
KBE2
KBE.3: 致能位元 (Keyboard Line 3 enable bit)
0 : KBI 禁能，預設為一般的出入埠(GPIO)
1 : KBI 致能，當觸發訊號輸入時，KBF.7 = 1，會觸發中斷
KBE.2: 致能位元 (Keyboard Line 2 enable bit)
0 : KBI 禁能，預設為一般的出入埠(GPIO)
1 : KBI 致能，當觸發訊號輸入時，KBF.7 = 1，會觸發中斷
KBE.1: 致能位元 (Keyboard Line 1 enable bit)
0 : KBI 禁能，預設為一般的出入埠(GPIO)
1 : KBI 致能，當觸發訊號輸入時，KBF.7 = 1，會觸發中斷
KBE.0: 致能位元 (Keyboard Line 0 enable bit)
0 : KBI 禁能，預設為一般的出入埠(GPIO)
1 : KBI 致能，當觸發訊號輸入時，KBF.7 = 1，會觸發中斷
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
2
Ver. A 2010/08
SM39R 系列 KBI 功能使用方法
Mnemonic: KBF
7
6
-
5
-
4
-
3
KBF3
2
KBF2
1
KBF1
Address: 95h
0
Reset
KBF0
00H
KBF.3: KBI 觸發旗標 (Keyboard Line 3 flag)
1: 當 KBI3 偵測到輸入訊號時，KBF.3 由硬體設為”1”，並產生 KBI 中斷；
0: 必須由軟體清除為”0”
KBF.2: KBI 觸發旗標 (Keyboard Line 2 flag)
1: 當 KBI2 偵測到輸入訊號時，KBF.2 由硬體設為”1”，並產生 KBI 中斷；
0: 必須由軟體清除為”0”
KBF.1: KBI 觸發旗標 (Keyboard Line 1 flag)
1: 當 KBI1 偵測到輸入訊號時，KBF.1 由硬體設為”1”，並產生 KBI 中斷；
0: 必須由軟體清除為”0”
KBF.0: KBI 觸發旗標 (Keyboard Line 0 flag)
1: 當 KBI0 偵測到輸入訊號時，KBF.0 由硬體設為”1”，並產生 KBI 中斷；
0: 必須由軟體清除為”0”
Mnemonic: KBD
7
6
KBDEN
-
5
-
4
-
3
-
2
-
1
KBD1
Address: 96h
0
Reset
KBD0
00H
KBDEN: 除彈跳功能致能位元(Enable KBI de-bounce function).
預設為致能(The default KBI function is enabled).
KBDEN = 0, 致能除彈跳功能
KBDEN = 1, 禁能除彈跳功能
KBD[1:0]: 除彈跳時間設定位元. 若 KBDEN = “0”，則預設為 320 ms.
KBD[1:0] = 00, 除彈跳時間為 320 ms.
KBD[1:0] = 01, 除彈跳時間為 160 ms.
KBD[1:0] = 10, 除彈跳時間為 80 ms.
KBD[1:0] = 11, 除彈跳時間為 40 ms.
Mnemonic: IEN1
7
6
EXEN2
-
5
IEIIC
4
IELVI
3
IEKBI
2
IEADC
1
IESPI
Address: B8h
0
Reset
IEPWM
00H
3
KBIIF
2
ADCIF
1
SPIIF
Address: C0h
0
Reset
PWMIF
00H
IEKBI: KBI interrupt enable.
IEKBI = 0 – Disable KBI interrupt.
IEKBI = 1 – Enable KBI interrupt.
Mnemonic: IRCON
7
6
EXF2
TF2
5
IICIF
4
LVIIF
KBIIF: KBI interrupt flag. Must be cleared by software.
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
3
Ver. A 2010/08
SM39R 系列 KBI 功能使用方法
2.7 以下是 KBI 相對應的中斷向量表：
Table 11-1: Interrupt vectors
Interrupt Vector
Address
0003h
000Bh
Interrupt Request Flags
IE0 – External interrupt 0
TF0 – Timer 0 interrupt
Interrupt Number
*(use Keil C Tool)
0
1
IE1 – External interrupt 1
0013h
2
TF1 – Timer 1 interrupt
001Bh
3
RI/TI – Serial channel interrupt
TF2/EXF2 – Timer 2 interrupt
0023h
002Bh
4
5
PWMIF – PWM interrupt
0043h
8
SPIIF – SPI interrupt
004Bh
9
ADCIF – A/D converter interrupt
0053h
10
KBIIF – keyboard Interface interrupt
005Bh
11
LVIIF – Low Voltage Interrupt
0063h
12
IICIF – IIC interrupt
006Bh
13
Comparator interrupt
0093h
18
*See Keil C about C51 User’s Guide about Interrupt Function description
KBI 中斷應用的參考程式：
1. KBI I/O 全部致能，Ch.0/Ch.1 高準位偵測 Ch.2/Ch.3 低準位偵測
Description
C 語言
2. De-bounce 時間為 40ms
//====================================================================
//
SYNCMOS
TECHNOLOGY
//====================================================================
#include "SM39R16A2.h"
#include " SM39R16A2_KBI.h "
#define KBI_VECTOR 11 //KBI Interrupt Vevtor
#define d_KBLS 0x03
//KBI Low/High level detection selection (0~0x0F)
#define d_KBEX 0x0F
//KBI Input Enable (0~0x0F)
#define d_KBDEN 0x00
//KBI De-bounce Function Enable
#define d_KBDS 0x03
//KBD[1:0] KBI De-bounce Time Selection (0~3)
#define d_KBIIE 0x01
//KBI Interrupt Enable bit
void KBI_initialize(void) //Initialize KBI
{
EA=0;
IEKBI=(d_KBIIE);
//Disable All Interrupt Function
//Enable KBI Interrupt Function
KBD=(d_KBDEN<<7)|(d_KBDS);
//Enable KBI De-bounce and De-bounce Time Function
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
4
Ver. A 2010/08
SM39R 系列 KBI 功能使用方法
KBLS=(d_KBLS);
//KBI Input High/Low Level Select
KBE=(d_KBEX);
//KBI Input Channel Enable
EA=1;
//Enable All Interrupt
}
//---------------------------------------------------------------------//
void KBI_Disable(void)
{
IEKBI=0;
//Disable KBI Interrupt
KBE=0;
//Disable KBI Function
}
//---------------------------------------------------------------------//
void KBI_ISR(void) interrupt KBI_VECTOR //KBI Interrupt Subroutine
{
switch(KBF)
//Decision Occur Channel Flag (KBF)
{
case 0x08:
//KBI Channel 3 Occur Interrupt(KBF3)
P1_3=0;
break;
case 0x04:
//KBI Channel 2 Occur Interrupt(KBF2)
P1_2=0;
break;
case 0x02:
//KBI Channel 1 Occur Interrupt(KBF1)
P1_1=0;
break;
case 0x01:
//KBI Channel 0 Occur Interrupt(KBF0)
P1_0=0;
break;
}
KBF=0;
////KBIIF=0;
//Hardware Clear KBI Flag
}
void main(void)
//Main Function Start
{
KBI_initialize(); //Call KBI Initial Subroutine
while(1);
//KBI_Disable();
}
Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
5
Ver. A 2010/08
SM39R 系列 KBI 功能使用方法
Description
1. KBI I/O 全部致能 Ch.0~3 高準位偵測 De-bounce 時間為 320ms
2. 當外部觸發訊號至 KBI I/O 時產生中斷，並將結果顯示於 Port1
匯編
//====================================================================
//
SYNCMOS
TECHNOLOGY
//====================================================================
SFR KBLS
= 0x93; ;Keyboard level selector register
SFR KBE
= 0x94; ;Keyboard input enable register
SFR KBF
= 0x95; ;Keyboard interrupt flag register
SFR KBD
= 0x96; ;de-bounce mechanism select
SFR IEN0
= 0xA8;
SFR IEN1
= 0xB8;
SFR IRCON
= 0xC0;
ORG
0000H
JMP
BEGIN
ORG
005BH
JMP
KBI_INT
;==================================================
;KBI INTERRUPT INIT ROUTINE
;==================================================
BEGIN:
MOV
IEN0,#80H
;EA =1
MOV
IEN1,#08H
;IEKBI =1
MOV
KBD,#00H
;KBI de-bounce function and set de-bounce time is 320 ms.
MOV
KBLS,#0FFH ;High level detect
;
MOV
KBLS,#00H
;Low level detect
MOV
KBE, #0FFH
;KBI all pin enable
MOV
KBF, #00H
;KBI all flag clear
JMP
START
;==================================================
;MAIN
;==================================================
START:
JMP
START
;==================================================
;KBI INTERRUPT ROUTINE
;==================================================
KBI_INT:
MOV
P1,KBF
MOV
KBF, #00H
ANL
IRCON,#08H
RETI
END
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Specifications subject to change without notice, contact your sales representatives for the most recent information.
ISSFA-0229
6
Ver. A 2010/08