Figure C-10 (c) Port A Block Diagram (Pins PA
4
to PA
6
)
WPAD:
WPA:
RPA:
n = 4 to 6
Write to PADDR
Write to port A
Read port A
PA
n
WPAD
Hardware
standby
Software standby
External bus released
Reset
PRA
WPA
Q
D
R
C
PA
n
DDR
Reset
Q
D
R
C
PA
n
DR
Internal address bus
Internal data bus
Bus controller
TPC
ITU
Chip select
enable
TPC output
enable
Next data
Output trigger
Output enable
Compare match
output
Input capture
Address
output
enable
CS
4
CS
5
CS
6
output
843
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