Table 30 and Table 31 relates the alternate functions of Port A to the overriding signals
shown in Figure 34 on page 67.
Table 30. Overriding Signals for Alternate Functions in PA7..PA4
Signal Name
PA7/AD7
PA6/AD6
PA5/AD5
PA4/AD4
PUOE
SRE •
SRE •
SRE •
SRE •
(ADA + WR)
(ADA + WR)
(ADA + WR)
(ADA + WR)
PUOV
DDOE
DDOV
PVOE
PVOV
0
0
0
0
SRE
SRE
SRE
SRE
WR + ADA
SRE
WR + ADA
SRE
WR + ADA
SRE
WR + ADA
SRE
A7 • ADA + D7
OUTPUT • WR
A6 • ADA + D6
OUTPUT • WR
A5 • ADA + D5
OUTPUT • WR
A4 • ADA + D4
OUTPUT • WR
PTOE
DIEOE
DIEOV
DI
0
0
0
0
0
0
0
0
0
0
0
0
D7 INPUT
D6 INPUT
D5 INPUT
D4 INPUT
AIO
–
–
–
–
Note:
1. ADA is short for ADdress Active and represents the time when address is output. See
“External Memory Interface” on page 24 for details.
Table 31. Overriding Signals for Alternate Functions in PA3..PA0
Signal Name
PA3/AD3
PA2/AD2
PA1/AD1
PA0/AD0
PUOE
SRE •
SRE •
SRE •
SRE •
(ADA + WR)
(ADA + WR)
(ADA + WR)
(ADA + WR)
PUOV
DDOE
DDOV
PVOE
PVOV
0
0
0
0
SRE
SRE
SRE
SRE
WR + ADA
SRE
WR + ADA
SRE
WR + ADA
SRE
WR + ADA
SRE
A3 • ADA + D3
OUTPUT • WR
A2 • ADA + D2
OUTPUT • WR
A1 • ADA + D1
OUTPUT • WR
A0 • ADA + D0
OUTPUT • WR
PTOE
DIEOE
DIEOV
DI
0
0
0
0
0
0
0
0
0
0
0
0
D3 INPUT
D2 INPUT
D1 INPUT
D0 INPUT
AIO
–
–
–
–
Note:
1. ADA is short for ADdress Active and represents the time when address is output. See
“External Memory Interface” on page 24 for details.
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