Mitsubishi M66014FP 16-bit serial bus controller Datasheet

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MITSUBISHI
MITSUBISHI
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M66014FP
M66014FP
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16-BIT SERIAL BUS CONTROLLER
16-BIT SERIAL BUS CONTROLLER
DESCRIPTION
M66014 Semiconductor Integrated Circuit is a serial bus controller. It converts 2-byte parallel data that arrives from microcomputer into serial and outputs it to serial bus. It also
converts serial data input from serial bus into parallel and outputs it to microcomputer.
The M66014 is used for the extension of microcomputer I/O
ports and two-way communication with peripheral equipment
connected with serial buses.
RESET INPUT RESET
1
24
VCC
WRITE INPUT
WR
2
23
RD
CHIP SELECT
INPUT
CS
3
22
A0
D0
4
21
A1
D1
5
20
SCLK SHIFT CLOCK OUTPUT
D2
6
19
SOUT SERIAL DATA OUTPUT
D3
7
18
SIN
SERIAL DATA INPUT
D4
8
17
OE
OUTPUT ENABLE OUTPUT
DATA BUS
APPLICATION
Microcomputer I/O port extension, etc.
M66014FP
FEATURES
• Compatible with general-purpose 8-bit microprocessor busses
• TTL level input (one microcomputer side)
• Interrupt output
• Schmitt input (RESET, CS, SIN)
• Pin arrangement is fully compatible with M66011FP
• Low power dissipation
• Wide operating temperature range (Ta = –20 to 75˚C)
PIN CONFIGURATION (TOP VIEW)
READ INPUT
ADDRESS INPUT
D5
9
16
INT
INTERRUPT OUTPUT
D6
10
15
Xin
CLOCK INPUT
D7
11
14
Xout
CLOCK OUTPUT
GND
12
13
VCC
Outline 24P2N-B
BLOCK DIAGRAM
A1
A0
21
22
SHIFT CLOCK OUTPUT
20 SCLK
RESET INPUT RESET 1
CHIP SELECT INPUT CS 3
READ INPUT RD 23
CLOCK INPUT
DATA BUS
17 OE
OUTPUT ENABLE OUTPUT
CLK, LOAD
Shift register for lower
byte serial output (8 bits)
Xin
15
Oscillation
circuit
CLOCK OUTPUT
16 INT INTERRUPT OUTPUT
Timing
control
circuit
WRITE INPUT WR 2
SRL
CLK, LOAD
Shift register for upper
byte serial output (8 bits)
SRU
19 SOUT
SERIAL DATA OUTPUT
14
Xout
D0
D1
D2
D3
D4
D5
D6
D7
4
5
6
7
8
9
10
11
CLK
Shift register for serial
input (16 bit)
8
8
8
Read
register
18 SIN
SERIAL DATA INPUT
8
X8
1
MITSUBISHI 〈DIGITAL ASSP〉
M66014FP
16-BIT SERIAL BUS CONTROLLER
3. Serial data input/output operation
A cycle of 16-bit serial output data setting and serial data
communication starts with a write access given by microcomputer to transmission shift registers in M66014.
M66014 has two 8-bit shift registers, on for upper byte
(SRU), the other for lower byte (SRL). If the CS status rises
from “L” to “H” after a write access is given to SRL, serial
data communication is started. SRU 8-bit data and SRL 8bit data are output in series in this order. Output of each
data starts from its most significant bit.
At the CS rise edge, busy flag in M66014 is set, and OE
output shifts from “H” to “L”. Shift clock SCLK and serial
data SOUT are then output.
At SCLK fall edges, serial output shift register executes
shifting operation, and data on shift register is output in series from pin SOUT. Serial input data from pin SIN is taken
into input shift register at SCLK rise edges.
After the SCLK 16T rise edge, the status of SOUT and OE
shifts to “H” after one bit’s delay of SCLK, and busy flag is
reset. When interrupt output is being set to enable, INT
output is set.
SRL
write operation
(Remarks)
(1) If CS rises after write operation is executed on SRL only
and not on SRU, SRU data is unstable.
(2) When write operations executed on SRL, M66014 becomes ready for start of serial communication and stands
by for detection of CS rise. However, if a read access is
given after data is written on SRL while CS is maintained
on “L” level, this standby status is canceled. To resume serial communication in this case, rewrite data on SRL and
raise CS.
Serial communication period
CS
Busy flag
(in M66014)
OE
INT
SCLK
1T
SOUT
2T
8T
D015 D014 D013 D012 D011 D010 D09
(D7U)
SIN
D08
9T
D07
16T
D06 D05
D03 D02
D01
(D0U) (D7L)
DI15 DI14 DI13 DI12 DI11 DI10
DI9
DI8
DI7
D00
(D0L)
DI6
DI5
Serial Communication Timing Chart
2
D04
DI4
DI3
DI2
DI1
DI0
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