Figure 18.2 16-Bit Port B - Hitachi SH7751 Hardware Manual

Figure 18.2 is a block diagram of the 16-bit general-purpose I/O port B, which has no interrupt
function.
Internal bus
PDTRW
PORTEN 0: Port not available 1: Port available
PBnPuP 0: Pull-up
DnDIR 0: Input
PBnIO 0: Input
PBnPUP
PORTEN
ADn output data
D Q
C
BCK
ADnDIR
PBnIO
Data input strobe
0
1
1: Pull-up off
1: Output
1: Output

Figure 18.2 16-Bit Port B

0
1
0
1
C
Q D
Rev. 3.0, 04/02, page 709 of 1064
Pull-up resistor
Port 31 (input/
output)/AD31
to
Port 16 (input/
output)/AD16
BCK