CHAPTER 14 PORT FUNCTION
349
(1) Function of P10 pins
Port 10 is an 8-bit I/O port for which I/O settings can be controlled bitwise. I/O settings are controlled via the port
10 mode register (PM10).
During output mode, the values set to each bit are output to the port register (P10). The port 10 function register
(PF10) can be used to specify whether outputs are normal outputs or N-ch open-drain outputs.
When using this port in input mode, the pin statuses can be read by reading the P10 register. Also, the P10
register (output latch) values can be read by reading the P10 register while in output mode.
A pull-up resistance can be connected bitwise when specified via the pull-up resistance option register 10
(PU10).
When using the alternate function as A5 to A12 pins, see the pin functions via the memory address output mode
register (MAM). The PM10 register must be set to 0.
Clear (to “0”) the P10 register and the PM10 register when using alternate-function pins as outputs. The ORed
result of the port output and the alternate-function pin is output from the pins.
When a reset is input, the settings are initialized to input mode.
(2) Control registers
(a) Port 10 mode register (PM10)
Read and write in 8-bit units and bitwise are enabled.
Figure 14-25. Format of Port 10 Mode Register (PM10)
After reset:
FFH
R/W
Address: FFFFF034H
7
6
5
4
3
2
1
0
PM10
PM107
PM106
PM105
PM104
PM103
PM102
PM101
PM100
PM10n
Control of I/O Mode
0
Output mode
1
Input mode
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