1121
R
P73DDR
C
Q
D
Reset
Internal data bus
WDDR7
Mode 7
Mode 4 to 6
Reset
WDR7
R
P73DR
C
Q
D
P73
RDR7
RPOR7
Bus controller
Chip select
DMA controller
DMA transfer end enable
DMA transfer end
8-bit timer
Timer output TMO1
Timer output enable
*
1
WDDR7
WDR7
RDR7
RPOR7
: Write to P7DDR
: Write to P7DR
: Read P7DR
: Read port 7
Legend
Note:
*
Priority order: (Mode7)
DMA transfer end output > 8-bit timer output > DR output
(Mode4/5/6)
Chip select output > DMA transfer end output > 8-bit timer output > DR output
Figure C-4 (c) Port 7 Block Diagram (Pin P73)