Block Diagrams; Figure 18.1 16-Bit Port A - Hitachi SH7751 Hardware Manual

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.
Interrupt
controller
PORTEN 0: Port not available
PBnPuP 0: Pull-up
DnDIR 0: Input
PBnIO 0: Input
PTIRENn 0: Interrupt input disabled 1: Interrupt input enabled
Rev. 3.0, 04/02, page 708 of 1064
PBnPUP
PORTEN
Internal bus
ADn output data
D Q
C
PDTRW
BCK
0
1
PTIRENn
1: Port available
1: Pull-up off
1: Output
1: Output

Figure 18.1 16-Bit Port A

0
1
0
ADnDIR
1
PBnIO
Data input strobe
Pull-up resistor
Port 15 (input/
output)/AD15
to
Port 0 (input/
output)/AD0
C
Q
D
BCK