SH7764 Datasheet, PDF (1437/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 27 General Purpose I/O (GPIO)
27.2.23 Pin Select Register 1 (PTSEL_B)
PTSEL_B is a 16-bit readable/writable register that selects the functions for the port B (PB) pins
that multiplex two or more functions other than the port function. To use one of these multiplexed
functions for a pin, the port control register should be set to select the functions other than the port
function after setting the corresponding bit in PTSEL_B.
Bit: 15 14
PTSEL_B7[1:0]
Initial value: 0
0
R/W: R/W R/W
13 12
PTSEL_B6[1:0]
0
0
R/W R/W
11 10
PTSEL_B5[1:0]
0
0
R/W R/W
9
8
PTSEL_B4[1:0]
0
0
R/W R/W
7
6
5
4
3
2
1
0

PTSEL_
B3

PTSEL_
B2

PTSEL_
B1

PTSEL_
B0
0
0
0
0
0
0
0
0
R R/W R R/W R R/W R R/W
Bit
15, 14
13, 12
11, 10
9, 8
Bit Name
Initial Value R/W
PTSEL_B7[1:0] 00
R
PTSEL_B6[1:0] 00
R/W
PTSEL_B5[1:0] 00
R/W
PTSEL_B4[1:0] 00
R/W
Description
Port B (PB7) Function Select
00: A25 function
01: PB7 function
10: DREQ0 function
11: RTS0 function
Port B (PB6) Function Select
00: A24 function
01: PB6 function
10: DACK0 function
11: CTS0 function
Port B (PB5) Function Select
00: A23 function
01: PB5 function
10: DTEND0 function
11: RTS1 function
Port B (PB4) Function Select
00: A22 function
01: PB4 function
10: CTS1 function
11: Setting prohibited
Rev. 1.00 Nov. 22, 2007 Page 1381 of 1692
REJ09B0360-0100