SH7751 Datasheet, PDF (846/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. I/O Ports
18.1.2 Block Diagrams
Figure 18.1 is a block diagram of the 16-bit general-purpose I/O port A with interrupt function.
PBnPUP
PORTEN
Pull-up resistor
Interrupt
controller
Internal bus
0
ADn output data
DQ
1
PDTRW C
BCK
0
ADnDIR
1
PBnIO
PTIRENn
0
Data input strobe
1
C
QD
PORTEN
PBnPuP
DnDIR
PBnIO
PTIRENn
0: Port not available
0: Pull-up
0: Input
0: Input
0: Interrupt input disabled
1: Port available
1: Pull-up off
1: Output
1: Output
1: Interrupt input enabled
Figure 18.1 16-Bit Port A
Port 15 (input/
output)/AD15
to
Port 0 (input/
output)/AD0
BCK
Rev.4.00 Oct. 10, 2008 Page 748 of 1122
REJ09B0370-0400