NEC V850E/RS1, User Manual, Page: 151 / 852

151
Chapter 4 Port Functions
User’s Manual U16702EE3V2UD00
(g) Pull-up resistor option register 9 (PU9)
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 PU9 register as the PU9H register and the lower
8 bits as the PU9L register, PU9 can be read and written in 8-bit and 1-bit units.
Figure 4-47: Pull-up Resistor Option Register 9 (PU9) Format
Symbol 15 14 13 12 11 10 9 8 Address After reset
PU9H PU915 PU914 PU913 PU912 0 PU910 PU99 PU98 FFFFFC53H 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
PU9L PU97 PU96 PU95 PU94 PU93 PU92 PU91 PU90 FFFFFC52H 0000H
R/W R/W R/W R/W R/W R/W R/W R/W R/W
PU9n Connection of a pull-up resistor control (n = 0 to 15)
0 Not connected
1 Connected
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