SH7108 Datasheet, PDF (465/560 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 15 I/O Ports
15.1.2 Port A Data Register L (PADRL)
PADRL is a 16-bit readable/writable register that stores port A data. Bits PA15DR to PA0DR
correspond to pins PA15 to PA0 (multiplexed functions omitted here).
When a pin functions is a general output, if a value is written to PADRL, that value is output
directly from the pin, and if PADRL is read, the register value is returned directly regardless of the
pin state.
When a pin functions is a general input, if PADRL is read, the pin state, not the register value, is
returned directly. If a value is written to PADRL, although that value is written into PADRL, it
does not affect the pin state. Table 15.1 summarizes port A data register L read/write operations.
Bit Bit Name Initial Value R/W Description
15 PA15DR 0
R/W See table 15.1.
14 PA14DR 0
R/W
13 PA13DR 0
R/W
12 PA12DR 0
R/W
11 PA11DR 0
R/W
10 PA10DR 0
R/W
9
PA9DR 0
R/W
8
PA8DR 0
R/W
7
PA7DR 0
R/W
6
PA6DR 0
R/W
5
PA5DR 0
R/W
4
PA4DR 0
R/W
3
PA3DR 0
R/W
2
PA2DR 0
R/W
1
PA1DR 0
R/W
0
PA0DR 0
R/W
Rev.1.00 Sep. 18, 2008 Page 431 of 522
REJ09B0069-0100