MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 65

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Pinout and Signal Descriptions
3.5.16 Port Pull-Up Pull-Down and Reduced Drive
Technical Data
65
PE7, PE[3:2]
Port Name
1. MC68HC912DT128A
2. MC68HC912DG128A
Port IB[7:6]
PS[7:0]
PT[7:0]
PE[1:0]
PE[6:4]
Port E:
Port S
Port T
Port H
Name
Port A
Port B
Port K
Port P
Port S
Port T
Port J
Port
Numbers
Input Loads
Table 3-4. Port Pull-Up, Pull-Down and Reduced Drive Summary
112-pin
18–15,
Resistive
Pull-down
Pull-down
Pull-up or
Pull-up or
96–89
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
7–4
Pin
None
Table 3-3. MC68HC912DT128A Port Description Summary
only
only
Register (Address)
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.
status and controls.
Data Direction
DDRS ($00D7)
DDRT ($00AF)
SP0CR2 ($00D1)
IBPURD ($00E5)
PWCTL ($0054)
TMSK2 ($008D)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
(Address)
In/Out
In/Out
Register
Pinout and Signal Descriptions
Enable Bit
—
Serial communications interfaces 1 and 0 and serial peripheral
General-purpose I/O when not enabled for input capture and
Bit Name
interface subsystems; or general-purpose I/O.
output compare in the timer and pulse accumulator
subsystem.
PUPIB
PUPE
PUPH
PUPP
PUPA
PUPB
PUPE
PUPK
PUPS
PUPJ
TPU
Table 3-4
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled PWCTL ($0054)
Disabled TMSK2 ($008D)
Disabled IBPURD ($00E5)
Enabled
Enabled
Enabled SP0CR2 ($00D1)
Reset
State
summarizes the port pull-up default
RDRIV ($000D)
RDRIV ($000D)
(Address)
Description
Register
Reduced Drive Control Bit
MC68HC912DT128A — Rev 4.0
Bit Name
—
RDPIB
RDPB
RDPE
RDPE
RDPH
RDPK
RDPP
RDPS
RDPA
TDRB
RDPJ
MOTOROLA
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Reset
State