SH7750_08 Datasheet, PDF (889/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 18 I/O Ports
Figure 18.2 shows a block diagram of the 4-bit general-purpose I/O port.
PBnPUP
PORTEN
Pull-up resistor
Internal bus
Dn output data
0
DQ
1
PDTRW C
BCK
0
DnDIR
1
PBnIO
0
Data input strobe
1
C
QD
Dn input data
Port 19 (input/
output)/D51
to
Port 16 (input/
output)/D48
BCK
PORTEN
PBnPuP
DnDIR
PBnIO
0: Port not available
0: Pull-up
0: Input
0: Input
1: Port available
1: Pull-up off
1: Output
1: Output
Figure 18.2 4-Bit Port
Rev.7.00 Oct. 10, 2008 Page 805 of 1074
REJ09B0366-0700