mc68hc912bl16 Freescale Semiconductor, Inc, mc68hc912bl16 Datasheet - Page 19

• Manufacturer Part Number: mc68hc912bl16
• Description: 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.5 Port Pull-Up, Pull-Down and Reduced Drive
MC68HC912BL16TS/D
PE7, PE3,
PE2, PE1,
Port AD
PE[6:4]
PE[6:5]
PS[7:4]
Port E:
BKGD
Name
Port A
Port B
Port P
Port S
Port T
Port
PE0
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.
Input Loads
Resistive
Pull-down
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
None
None
Table 7 Port Pull-Up, Pull-Down and Reduced Drive Summary
PURDS ($00DB)
PURDS ($00DB)
PWCTL ($0054)
TMSK2 ($008D)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
Freescale Semiconductor, Inc.
(Address)
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—
Enabled During Reset
Go to: www.freescale.com
Enable Bit
Bit Name Reset State
—
PUPS0
PUPS2
—
PUPA
PUPB
PUPE
PUPP
PUPT
—
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
PURDS ($00DB)
PURDS ($00DB)
PWCTL ($0054)
TMSK2 ($008D)
RDRIV ($000D)
RDRIV ($000D)
RDRIV ($000D)
RDRIV ($000D)
(Address)
Register
Reduced Drive Control Bit
—
—
Bit Name
—
RDPS0
RDPS2
RDPA
RDPB
RDPE
RDPE
RDPP
RDPT
—
—
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Full Drive
Reset
State
—
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