MC912DG128A Motorola, MC912DG128A Datasheet - Page 49

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

Port Pull-Up
Pull-Down and
Reduced Drive
23-pins
MOTOROLA
PE7, PE[3:2]
1 MC68HC912DT128A
2 MC68HC912DG128A
Port Name
PP[3:0]
PS[7:0]
PT[7:0]
PE[1:0]
PE[6:4]
Port E:
Port P
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
112-pin
18–15,
Resistive
Pull-up or
Pull-down
Pull-up or
Pull-down
96–89
112,
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
Pull-up
1–3
7–4
Pin
None
Table 7 MC68HC912DT128A Port Description Summary
Table 1 Port Pull-Up, Pull-Down and Reduced Drive 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)
DDRP ($0057)
SP0CR2 ($00D1)
PWCTL ($0054)
TMSK2 ($008D)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
PUCR ($000C)
(Address)
In/Out
In/Out
In/Out
Register
Pinout and Signal Descriptions
Enable Bit
—
General-purpose I/O. PP[3:0] are used with the pulse-width
modulator when enabled.
Serial communications interfaces 1 and 0 and serial peripheral
interface subsystems; or general-purpose I/O.
General-purpose I/O when not enabled for input capture and
output compare in the timer and pulse accumulator subsystem.
Bit Name
PUPB
PUPE
PUPE
PUPH
PUPK
PUPP
PUPS
PUPA
PUPJ
TPU
Table 1
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled RDRIV ($000D)
Disabled PWCTL ($0054)
Disabled TMSK2 ($008D)
Enabled
Enabled
Enabled
Reset
State
summarizes the port pull-up default
RDRIV ($000D)
RDRIV ($000D)
(Address)
Description
Register
SP0CR2
($00D1)
Reduced Drive Control Bit
Pinout and Signal Descriptions
MC68HC912DT128A Rev 2.0
Bit Name
—
RDPB
RDPE
RDPE
RDPH
RDPK
RDPP
RDPS
RDPA
TDRB
RDPJ
Port Signals
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Reset
State
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