C.10 Port A Block Diagrams
Figure C-10 (a) Port A Block Diagram (Pins PA
0
, PA
1
)
WPAD:
WPA:
RPA:
n = 0 and 1
Write to PADDR
Write to port A
Read port A
PA
n
WPAD
Reset
Q
D
R
C
PA DDR
n
Reset
Q
D
R
C
PA DR
n
RPA
WPA
Internal data bus
TPC
output
enable
TPC
Next data
Output
trigger
Output
enable
Transfer
end output
DMA controller
Counter
clock input
ITU
841
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