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): 3/144頁
文件大小: 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
100
User’s Manual U15075EJ1V0UM00
(5)
Pull-up resistor option register B7 (PUB7)
Pull-up resistor option register B7 (PUB7) sets whether on-chip pull-up resistors on P70 to P72 are used or
not. On the port specified to use an on-chip pull-up resistor by PUB7, 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 PUB7. This also applies to when the pins are used for alternate function.
PUB7 is set with a 1-bit or 8-bit memory manipulation instructions.
RESET input sets PUB7 to 00H.
Figure 4-22. Format of Pull-Up Resistor Option Register B7
P7n on-chip pull-up resistor selection
(n = 0 to 2)
00
0
PUB72 PUB71 PUB70
PUB7
Address
After reset
R/W
FF37H
00H
R/W
76543
<2>
<1>
<0>
PUB7n
0
1
On-chip pull-up resistor not used
On-chip pull-up resistor used
Symbol
(6)
Pull-up resistor option register B8 (PUB8)
Note
Pull-up resistor option register B8 (PUB8) sets whether on-chip pull-up resistors on P80 and P81 are used or
not. On the port specified to use an on-chip pull-up resistor by PUB8, 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 PUB8. This also applies to when the pins are used for alternate functions.
PUB8 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PUB8 to 00H.
Note
Incorporated only in the
PD789426 and 789436 Subseries.
Figure 4-23. Format of Pull-Up Resistor Option Register B8
P8n on-chip pull-up resistor selection
(n = 0, 1)
000000
PUB81 PUB80
PUB8
Address
After reset
R/W
FF38H
00H
R/W
765432
<1>
<0>
PUB8n
0
1
On-chip pull-up resistor not used
On-chip pull-up resistor used
Symbol
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