M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 18

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

Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 18 Block diagram of ports (2)
(9) Ports P2
(11) Ports P3
(7) Port P1
Serial I/O mode selection bit
Data bus
Data bus
Data bus
*
2004.06.08
S
P1
When the TTL level is selected, there is no hysteresis characteristics.
RDY
Serial I/O enable bit
0
, P1
output enable bit
3
0
Serial I/O ready output
–P2
4
2
, P3
, P3
5
Direction
register
Port latch
INT interrupt input
4
Port latch
7
Direction
register
, and P3
Port latch
Direction
register
page 18 of 66
Pull-up control
7
A/D converter input
input level are switched to the CMOS/TTL level by the port P1P3 control register.
P3 input level
selection bit
Analog input pin
selection bit
*
(10) Ports P3
(8) Port P1
Data bus
Data bus
Pulse output mode
4
0
–P3
Timer output
Port latch
Port latch
Direction
register
Direction
register
3
Pull-up control
CNTR
0
interrupt input