650
PA
n
DDR
Reset
Software standby
Address output enable
Mode 3
Q
D
C
Reset
R
Q
D
PA
n
DR
WPAD
C
PA
n
WPAD:
WPA:
RPA:
n = 4 to 7
Note: PA
7
address output enable is fixed at 1 in mode 3.
Write to PADDR
Write to port A
Read port A
R
RPA
WPA
Internal data bus
Internal address bus
TPC
TPC output
enable
Output trigger
Next data
ITU
Output enable
Compare
match output
Input capture
input
Figure C-9 (c) Port A Block Diagram (Pins PA
4
to PA
7
)