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參數(shù)資料
型號: MC68B912B32FU8
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-Bit Microcontroller
中文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 19/128頁
文件大小: 748K
代理商: MC68B912B32FU8
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
19
3.5 Port Pull-Up, Pull-Down and Reduced Drive
MCU ports can be configured for internal pull-up. To reduce power consumption and RFI, the pin output
drivers can be configured to operate at a reduced drive level. Reduced drive causes a slight increase
in transition time depending on loading and should be used only for ports which have a light loading.
Table 7
summarizes the port pull-up default status and controls.
Table 7 Port Pull-Up, Pull-Down and Reduced Drive Summary
Enable Bit
Reduced Drive Control Bit
Register
(Address)
RDRIV ($000D)
RDRIV ($000D)
Port
Name
Port A
Port B
Port E:
PE7, PE3,
PE2, PE0
PE1
PE[6:4]
PE[6:5]
Port P
Port S
PS[3:2]
PS[7:4]
Port T
Port DLC
Port AD
BKGD
Resistive
Input Loads
Pull-up
Pull-up
Register
(Address)
PUCR ($000C)
PUCR ($000C)
Bit Name Reset State
Bit Name
Reset
State
Full Drive
Full Drive
PUPA
PUPB
Disabled
Disabled
RDPA
RDPB
Pull-up
PUCR ($000C)
PUPE
Enabled
RDRIV ($000D)
RDPE
Full Drive
Pull-up
None
Pull-down
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
None
Pull-up
Always Enabled
Enabled During Reset
PWCTL ($0054)
PURDS ($00DB)
PURDS ($00DB)
PURDS ($00DB)
TMSK2 ($008D)
DLCSCR ($00FD) DLCPUE
RDRIV ($000D)
RDRIV ($000D)
PWCTL ($0054)
PURDS ($00DB)
PURDS ($00DB)
PURDS ($00DB)
TMSK2 ($008D)
DLCSCR ($00FD)
RDPE
RDPE
RDPP
RDPS0
RDPS1
RDPS2
RDPT
DLCRDV
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
PUPP
PUPS0
PUPS1
PUPS2
PUPT
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Enabled
Full Drive
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