M37544G Mitsubishi Electric, M37544G Datasheet - Page 15

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

Fig. 15 Block diagram of ports (1)
(1)Port P0
(3)Port P0
(5)Port P1
Data bus
Data bus
Data bus
P1
1
0
3
Serial I/O enable bit
1
/T
Transmit enable bit
x
Timer output
D P-channel output disable bit
*
Direction
register
Port latch
Direction
register
Port latch
Port latch
When the TTL level is selected, there is no hysteresis characteristics.
P1
Serial I/O output
Direction
register
0
Pull-up control
CNTR
, P1
To key input interrupt
generating circuit
2
, P3
1
interrupt input
4
Pull-up control
and P3
To key input interrupt
generating circuit
P0
output valid
7
3
input level are switched to the CMOS/TTL level by the port P1P3 control register.
/TX
OUT
P0
selection bit
0
key-on wakeup
Data bus
(6)Port P1
(2)Ports P0
(4)Port P1
Serial I/O synchronous
Serial I/O enable bit
Serial I/O mode selection bit
Data bus
Data bus
Serial I/O enable bit
clock selection bit
Receive enable bit
Serial I/O enable bit
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Serial I/O clock output
2
0
1,
P0
Direction
register
Port latch
2,
Port latch
Direction
register
Port latch
P0
Direction
register
MITSUBISHI MICROCOMPUTERS
4–
Pull-up control
P0
To key input interrupt
generating circuit
Serial I/O clock input
Serial I/O input
7
7544 Group
P1
input level
selection bit
0
, P1
P1
input level
selection bit
*
2
0
, P1
*
2
15