參數(shù)資料
型號: m789436
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位單芯片微控制器
文件頁數(shù): 4/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ1V0UM00
101
(7)
Pull-up resistor option register B9 (PUB9)
Note
Pull-up resistor option register B9 (PUB9) sets whether on-chip pull-up resistors on P90 to P97 are used or
not. On the port specified to use an on-chip pull-up resistor by PUB9, the pull-up resistor can be internally
used only for bits set in the input mode. No on-chip pull-up resistors can be used for the bits set in the output
mode regardless of the setting of PUB9. This also applies to when the pins are used for alternate function.
PUB9 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PUB9 to 00H.
Note
Incorporated only in the
PD789426 and 789436 Subseries.
Figure 4-24. Format of Pull-Up Resistor Option Register B9
P9n on-chip pull-up resistor selection
(n = 0 to 7)
PUB97 PUB96 PUB95 PUB94 PUB93 PUB92 PUB91 PUB90
PUB9
Address
After reset
R/W
FF39H
00H
R/W
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
PUB9n
0
1
On-chip pull-up resistor not used
On-chip pull-up resistor used
Symbol
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