NEC V850E/RS1, Руководство пользователя, Страница: 130 / 852

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Chapter 4 Port Functions
User’s Manual U16702EE3V2UD00
(g) Pull-up resistor option register 3 (PU3)
This is a 16-bit register used to set whether to use an on-chip pull-up resistor.
This register can be read and written only in 16-bit units.
However, when using the higher 8 bits of the PU3 register as the PU3H register and the lower
8 bits as the PU3L register, PU3 can be read and written in 8-bit and 1-bit units.
Figure 4-25: Pull-up Resistor Option Register 3 (PU3) Format
(h) Pull-down resistor option register 3 (PD3)
This is a 16-bit register used to set whether to use an on-chip pull-down resistor.
This register can be read and written only in 16-bit units.
However, when using the higher 8 bits of the PD3 register as the PD3H register and the lower
8 bits as the PD3L register, PD3 can be read and written in 8-bit and 1-bit units.
Figure 4-26: Pull-down Resistor Option Register 3 (PD3) Format
Symbol 15 14 13 12 11 10 9 8 Address After reset
PU3H 0 0 0 0 0 0 0 PU38 FFFFFC47H 0000H
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Symbol 7 6 5 4 3 2 1 0 Address After reset
PU3L PU37 PU36 PU35 PU34 PU33 PU32 PU31 PU30 FFFFFC46H 0000H
R/W R/W R/W R/W R/W R/W R/W R/W R/W
PU3n Connection of a pull-up resistor control (n = 0 to 8)
0 Not connected
1 Connected
Symbol 15 14 13 12 11 10 9 8 Address After reset
PD3H 0 0 0 0 0 0 0 PD38 FFFFFCA7H 0000H
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Symbol 7 6 5 4 3 2 1 0 Address After reset
PD3L PD37 PD36 PD35 PD34 PD33 PD32 PD31 PD30 FFFFFCA6H 0000H
R/W R/W R/W R/W R/W R/W R/W R/W R/W
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