C501_1 Datasheet, PDF (43/121 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller

On-Chip Peripheral Components
C501
Ports 1 and 3 are provided for several alternate functions, as listed in table 6-4:
Table 6-4
Alternate Functions of Port 1 and 3
Port
P1.0
P1.1
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
Pin
T2
T2EX
RxD
TxD
INT0
INT1
T0
T1
WR
RD
Alternate Function
Input to counter 2
Capture-reload trigger of timer 2 / up down count
Serial port’s receiver data input (asynchronous) or data input/output
(synchronous)
Serial port’s transmitter data output (asynchronous) or data clock output
(synchronous)
External interrupt 0 input, timer 0 gate control
External interrupt 1 input, timer 1 gate control
Timer 0 external counter input
Timer 1 external counter input
External data memory write strobe
External data momory read strobe
Semiconductor Group
6-9