參數(shù)資料
型號(hào)： MC68HC912BL16FU8
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁數(shù)： 40/128頁
文件大?。?/td> 3326K
代理商： MC68HC912BL16FU8
MC68HC912BL16TS/D
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
Port
Name
Resistive
Input Loads
Register
(Address)
Bit Name Reset State
Register
(Address)
Bit Name
Reset
State
Port A
Pull-up
PUCR ($000C)
PUPA
Disabled
RDRIV ($000D)
RDPA
Full Drive
Port B
Pull-up
PUCR ($000C)
PUPB
Disabled
RDRIV ($000D)
RDPB
Full Drive
Port E:
PE7, PE3,
PE2, PE1,
PE0
Pull-up
PUCR ($000C)
PUPE
Enabled
RDRIV ($000D)
RDPE
Full Drive
PE[6:4]
None
—
RDRIV ($000D)
RDPE
Full Drive
PE[6:5]
Pull-down
Enabled During Reset
—
Port P
Pull-up
PWCTL ($0054)
PUPP
Disabled
PWCTL ($0054)
RDPP
Full Drive
Port S
Pull-up
PURDS ($00DB)
PUPS0
Disabled
PURDS ($00DB)
RDPS0
Full Drive
PS[7:4]
Pull-up
PURDS ($00DB)
PUPS2
Disabled
PURDS ($00DB)
RDPS2
Full Drive
Port T
Pull-up
TMSK2 ($008D)
PUPT
Disabled
TMSK2 ($008D)
RDPT
Full Drive
Port AD
None
—
BKGD
Pull-up
—
Enabled
—
Full Drive
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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