HD6417750 Datasheet, PDF (784/1039 Pages) Renesas Technology Corp – SuperH RISC engine

18.1.2 Block Diagrams
Figure 18.1 shows a block diagram of the 16-bit general-purpose I/O port.
PBnPUP
PORTEN
Pull-up resistor
Interrupt
controller
Internal bus
0
Dn output data
DQ
1
PDTRW C
BCK
0
DnDIR
1
PBnIO
PTIRENn
0
Data input strobe
1
Dn input data
Q
C
D
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
Port 15 (input/
output)/D47
to
Port 0 (input/
output)/D32
BCK
Rev. 6.0, 07/02, page 732 of 986