M37544 Datasheet, PDF (18/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
(7) Port P13
Serial I/O mode selection bit
Serial I/O enable bit
SRDY output enable bit
Direction
register
Data bus
Port latch
Serial I/O ready output
(8) Port P14
Data bus
Direction
register
Port latch
Pulse output mode
Timer output
CNTR0 interrupt input
(9) Ports P20–P25
Direction
register
Data bus
Port latch
(10) Ports P30–P33
Pull-up control
Direction
register
Data bus
Port latch
A/D converter input
Analog input pin
selection bit
(11) Ports P34, P37
Data bus
Pull-up control
Direction
register
Port latch
INT interrupt input
P3 input level
selection bit
*
* P10, P12, P34, and P37 input level are switched to the CMOS/TTL level by the port P1P3 control register.
When the TTL level is selected, there is no hysteresis characteristics.
Fig. 18 Block diagram of ports (2)
Rev.1.04 2004.06.08 page 18 of 66
REJ03B0012-0104Z