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611
•
Bit 8—PA20 Mode (PA20MD): Selects the function of the PA20/
CASHL
pin.
Bit 8: PA20MD
Description
0
General input/output (PA20) (initial value)
1
Column address output (
CASHL
) (PA20 in single chip mode)
•
Bits 7 and 6—PA19 Mode 1, 0 (PA19MD1 and PA19MD0): These bits select the function of
the PA19/
BACK
/DRAK1 pin.
Bit 7:
PA19MD1
Bit 6:
PA19MD0
Description
0
0
General input/output (PA19) (initial value)
1
Bus right request acknowledge (
BACK
) (PA19 in single chip
mode)
1
0
DREQ1 request received output (DRAK1) (PA19 in single
chip mode)
1
Reserved
•
Bits 5 and 4—PA18 Mode 1, 0 (PA18MD1 and PA18MD0): These bits select the function of
the PA18/
BREQ
/DRAK0 pin.
Bit 5:
PA18MD1
Bit 4:
PA18MD0
Description
0
0
General input/output (PA18) (initial value)
1
Bus right request input (
BREQ
) (PA18 in single chip mode)
1
0
DREQ0 request received output (DRAK0) (PA18 in single
chip mode)
1
Reserved
•
Bit 3—Reserved: This bit always reads as 0. The write value should always be 0.
•
Bit 2—PA17 Mode (PA17MD): Selects the function of the PA17/
WAIT
pin.
Bit 2: PA17MD
Description
0
General input/output (PA17) (initial value)
1
Wait state request input (
WAIT
) (PA17 in single chip mode)
•
Bit 1—Reserved: This bit always reads as 0. The write value should always be 0.
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