MC68HC912DG128 Datasheet, PDF (60/452 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
3.5.15 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 3-4 summarizes the port pull-up/pull-
down default status and controls.
Table 3-4. Port Pull-Up, Pull-Down and Reduced Drive Summary
Port
Name
Resistive
Input Loads
Port A
Pull-up
Port B
Pull-up
Port E:
PE7, PE[3:2] Pull-up
PE[1:0]
Pull-up
PE[6:4]
None
Port H
Pull-up or
Pull-down
Port J
Pull-up or
Pull-down
Port K
Pull-up
Port P
Pull-up
Port S
Pull-up
Port T
Pull-up
Port IB[7:4] Pull-up
Port IB[3:2] Pull-up
Port AD0
None
Port AD1
None
Port CAN1[1] None
Port CAN1[0] Pull-up
Port CAN0[1] None
Port CAN0[0] Pull-up
Enable Bit
Register
(Address)
Bit Name
Reset
State
PUCR ($000C) PUPA Disabled
PUCR ($000C) PUPB Disabled
Reduced Drive Control Bit
Register
(Address)
Bit Name
Reset
State
RDRIV ($000D) RDPA Full drive
RDRIV ($000D) RDPB Full drive
PUCR ($000C) PUPE
PUCR ($000C) PUPE
—
PUCR ($000C) PUPH
Enabled
Enabled
RDRIV ($000D)
RDRIV ($000D)
RDPE
—
RDPE
Disabled RDRIV ($000D) RDPH
Full drive
Full drive
Full drive
PUCR ($000C) PUPJ Disabled RDRIV ($000D) RDPJ
PUCR ($000C) PUPK Disabled RDRIV ($000D)
PWCTL ($0054) PUPP Disabled PWCTL ($0054)
SP0CR2 ($00D1) PUPS Enabled SP0CR2 ($00D1)
TMSK2 ($008D) TPU Disabled TMSK2 ($008D)
IBPURD ($00E5) PUPIB Disabled IBPURD ($00E5)
Always enabled when pins are input IBPURD ($00E5)
—
—
—
Always enabled
—
Always enabled
RDPK
RDPP
RDPS
TDRB
RDPIB
RDPIB
—
—
—
—
—
—
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Technical Data
60
MC68HC912DG128 — Rev 3.0
Pinout and Signal Descriptions
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA