RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 4 PORT FUNCTIONS
4.2.8 Port 7
Port 7 is a 6-bit I/O port with an output latch. Port 7 can be set to the input mode or output mode in 1-bit units using port
mode register 7 (PM7). When the P70 to P75 pins are used as an input port, use of an on-chip pull-up resistor can be
specified in 1-bit units by pull-up resistor option register 7 (PU7).
Input to the P70 pin can be specified through a normal Schmitt3 input buffer or a Schmitt1 input buffer using port input
mode register 7 (PIM7).
These pins also function as A/D conversion start trigger input, output pins for the sound generator, serial interface data
I/O, timer I/O, clock / buzzer output, flash memory programming I/O, external interrupt request input, and segment signal
outputs for the LCD controller/driver.
To use P70 to P75 as the port function, refer Table 4-8.
P70 to P75 Pins LCDPF7 Alternate function
port function
P70
P71
P72
P73
P74
P75
Table 4-8. Setting of P70 to P75 Pins to port function
Register Timer/
SGO
Serial
R01UH0317EJ0004 Rev. 0.04 180
Feb. 22, 2013
PM7
Register
Input port N/A
- N/A Input mode
Output port
0
Input port N/A N/A
- Input mode
Output port
PIM7
Register
Output mode -
1 Output mode
Input port Digital I/O - N/A Input mode
Output port
selection
0
Output mode -
Input port Digital I/O - N/A Input mode
Output port
selection
0
Output mode
Input port Digital I/O - - Input mode
Output port
selection
0 1 Output mode
Input port Digital I/O - N/A Input mode
Output port
selection
0
Output mode
- - LCD
Segment
output
selection
Reset signal generation sets port 7 to input mode.
Figures 4-28 to 4-32 show block diagrams of port 7.
POM
Register
Remarks
0 N/A Schmitt1 input
1 Schmitt3 input
N/A N/A
N/A
- N/A
N/A N/A
- N/A
- - - - - LCD segment output