M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 17

• Manufacturer Part Number: M37544
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 17 Block diagram of ports (1)
(1)Port P0
(3)Port P0
(5)Port P1
Data bus
Data bus
Data bus
P1
2004.06.08
1
Serial I/O enable bit
0
3
1
/T
Transmit enable bit
x
D P-channel output disable bit
Timer output
*
P1
When the TTL level is selected, there is no hysteresis characteristics.
Direction
register
Direction
register
Port latch
Port latch
Port latch
Serial I/O output
0
Direction
register
, P1
Pull-up control
CNTR
To key input interrupt
generating circuit
2
, P3
page 17 of 66
1
4
interrupt input
, and P3
Pull-up control
To key input interrupt
generating circuit
P0
output valid
7
input level are switched to the CMOS/TTL level by the port P1P3 control register.
3
/TX
OUT
P0
selection bit
0
key-on wakeup
(2)Ports P0
(4)Port P1
Data bus
Data bus
Data bus
Serial I/O enable bit
(6)Port P1
Serial I/O synchronous
Receive enable bit
Serial I/O mode selection bit
Serial I/O enable bit
clock selection bit
0
1
Serial I/O enable bit
,P0
Serial I/O clock output
2
2
,P0
Port latch
Direction
register
Port latch
Direction
register
Direction
register
Port latch
4–
Pull-up control
P0
To key input interrupt
generating circuit
Serial I/O input
7
Serial I/O clock input
P1
input level
selection bit
0
, P1
2
*
P1
input level
selection bit
0
, P1
2
*