HD6417751RBP240V Datasheet, PDF (849/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

18. I/O Ports
Figure 18.2 is a block diagram of the 16-bit general-purpose I/O port B, which has no interrupt
function.
PBnPUP
PORTEN
Pull-up resistor
Internal bus
ADn output data
0
DQ
1
PDTRW C
BCK
0
ADnDIR
1
PBnIO
0
Data input strobe
1
C
QD
Port 31 (input/
output)/AD31
to
Port 16 (input/
output)/AD16
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 16-Bit Port B
Rev.4.00 Oct. 10, 2008 Page 749 of 1122
REJ09B0370-0400