Jameco Electronics 3000 User Manual
User’s Manual
139
Table 9-11. Parallel Port E Register functions
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PEDR (R/W)
adr = 0x070
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
PEFR (W)
adr = 0x075
alt /I7
alt /I6
alt /I5
alt /I4
alt /I3
alt /I2
alt /I1
alt /I0
PEDDR (W)
adr = 0x077
adr = 0x077
dir =
out
out
dir =
out
out
dir =
out
out
dir =
out
out
dir =
out
out
dir =
out
out
dir =
out
out
dir =
out
out
PEB0R (W)
adr = 0x078
x
x
x
x
x
x
x
PE0
PEB1R (W)
adr = 0x079
x
x
x
x
x
x
PE1
x
PEB2R (W)
adr = 0x07A
x
x
x
x
x
PE2
x
x
PEB3R (W)
adr = 0x07B
x
x
x
x
PE3
x
x
x
PEB4R (W)
adr = 0x07C
x
x
x
PE4
x
x
x
x
PEB5R (W)
adr = 0x07D
x
x
PE5
x
x
x
x
x
PEB6R (W)
adr = 0x07E
x
PE6
x
x
x
x
x
x
PEB7R (W)
adr = 0x07F
PE7
x
x
x
x
x
x
x
Table 9-12. Parallel Port E Control Register (adr = 0x074)
Bits 7, 6
Bits 5, 4
Bits 3, 2
Bits 1, 0
x,x
00—clock upper nibble on pclk/2
01—clock on timer A1
10—clock on timer B1
11—clock on timer B2
x,x
00—clock lower nibble on pclk/2
01—clock on timer A1
10—clock on timer B1
11—clock on timer B2