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Rabbit 3000 Microprocessor
The following registers are described in Table 9-11 and in Table 9-12.
•
PEDR—Port E data register. Reads value at pins. Writes to port E preload register.
•
PEDDR—Port E data direction register. Set to "1" to make corresponding pin an out-
put. This register is zeroed on reset.
•
PEFR—Port E function register. Set bit to "1" to make corresponding output an I/O
strobe. The nature of the I/O strobe is controlled by the I/O bank control registers
(IBxCR). The data direction must be set to output for the I/O strobe to work.
•
PEBxR—These are individual registers to set individual output bits on or off.
•
PECR—Parallel Port E control register. This register is used to control the clocking of
the upper and lower nibble of the final output register of the port. On reset, bits 0, 1, 4,
and 5 are reset to zero.
On reset, the data direction register and function register are zeroed, making all pins
inputs, and disabling the alternate output functions. In addition certain bits in the control
register are zeroed (bits 0,1,4,5) to ensure that data is clocked into the output registers
when loaded. All other registers associated with Port E are not initialized on reset.
Table 9-10. Parallel Port E Registers
Register Name
Mnemonic
I/O address
R/W
Reset
Port E Data Register
PEDR
0x70
R/W
xxxxxxxx
Port E Control Register
PECR
0x74
W
xx00xx00
Port E Function Register
PEFR
0x75
W
00000000
Port E Data Direction Register
PEDDR
0x77
W
00000000
Port E Bit 0 Register
PEB0R
0x78
W
xxxxxxxx
Port E Bit 1 Register
PEB1R
0x79
W
xxxxxxxx
Port E Bit 2 Register
PEB2R
0x7A
W
xxxxxxxx
Port E Bit 3 Register
PEB3R
0x7B
W
xxxxxxxx
Port E Bit 4 Register
PEB4R
0x7C
W
xxxxxxxx
Port E Bit 5 Register
PEB5R
0x7D
W
xxxxxxxx
Port E Bit 6 Register
PEB6R
0x7E
W
xxxxxxxx
Port E Bit 7 Register
PEB7R
0x7F
W
xxxxxxxx
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