M37544 Datasheet, PDF (17/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
(1)Port P00
Data bus
Pull-up control
Direction
register
Port latch
CNTR1 interrupt input
To key input interrupt
generating circuit
(2)Ports P01,P02,P04–P07
Pull-up control
Direction
register
Data bus
Port latch
P00 key-on wakeup
selection bit
To key input interrupt
generating circuit
(3)Port P03
Direction
register
Pull-up control
Data bus
Port latch
Timer output
P03/TXOUT
output valid
To key input interrupt
generating circuit
(4)Port P10
Serial I/O enable bit
Receive enable bit
Direction
register
Data bus
Port latch
Serial I/O input
P10, P12
input level
selection bit
*
(5)Port P11
P11/TxD P-channel output disable bit
Serial I/O enable bit
Transmit enable bit
Direction
register
Data bus
Port latch
Serial I/O output
(6)Port P12
Serial I/O synchronous
clock selection bit
Serial I/O enable bit
Serial I/O mode selection bit
Serial I/O enable bit
Direction
register
Data bus
Port latch
Serial I/O clock output
Serial I/O clock input
P10, P12
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. 17 Block diagram of ports (1)
Rev.1.04 2004.06.08 page 17 of 66
REJ03B0012-0104Z