Rabbit RabbitCore RCM3000, Руководство пользователя

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108 RabbitCore RCM3000
Table E-2. Parallel Port F Registers
Register Name Mnemonic I/O Address R/W Reset Value
Port F Data Register PFDR 00111000 (0x38) R/W xxxxxxxx
Bits Value Description
0:7 Read Current state of pins
Write
Port buffer. Value transferred to O/P register on next
rising edge of transfer clock.
Port F Control Register PFCR 00111100 (0x3C) W only xx00xx00
Bits Value Description
0:1 00 Lower nibble transfer clock is CLK/2
01 Lower nibble transfer clock is Timer A1
10 Lower nibble transfer clock is Timer B1
11 Lower nibble transfer clock is Timer B2
2:3 xx These bits are ignored
4:5 00 Upper nibble transfer clock is CLK/2
01 Upper nibble transfer clock is Timer A1
10 Upper nibble transfer clock is Timer B1
11 Upper nibble transfer clock is Timer B2
6:7 xx These bits are ignored
Port F Function Register PFFR 00111101 (0x3D) W xxxxxxxx
Bits Value Description
0:7 0 Corresponding port bits function normally
0 1 Bit 0 carries SCLK_D
1 1 Bit 1 carries SCLK_C
2:3 x No effect
4 1 Bit 4 carries PWM[0] output
5 1 Bit 5 carries PWM[1] output
6 1 Bit 6 carries PWM[2] output
7 1 Bit 7 carries PWM[3] output
Port F Drive Control Register PFDCR 00111110 (0x3E) W xxxxxxxx
Bits Value Description
0:7 0 Corresponding port bit is active high or low
1 Corresponding port bit is open drain
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