649
Internal data bus
PA
n
DDR
Reset
Q
D
C
Reset
R
Q
D
PA
n
DR
WPAD
C
PA
n
WPAD:
WPA:
RPA:
n = 2 or 3
Write to PADDR
Write to port A
Read port A
TPC
R
TPC output
enable
Output trigger
Next data
Input capture
input
RPA
WPA
ITU
Output enable
Compare
match output
Counter input
clock
Figure C-9 (b) Port A Block Diagram (Pins PA
2
and PA
3
)