MC912DG128ACPVE Datasheet, PDF (65/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
Table 3-3. MC68HC912DT128A Port Description Summary
Port Name
Port S
PS[7:0]
Port T
PT[7:0]
Pin
Numbers
112-pin
96–89
18–15,
7–4
Data Direction
Register (Address)
Description
In/Out
DDRS ($00D7)
In/Out
DDRT ($00AF)
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.
1. MC68HC912DT128A only
2. MC68HC912DG128A only
3.5.16 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 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[7:6] 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)
PUCR ($000C)
PWCTL ($0054)
SP0CR2 ($00D1)
TMSK2 ($008D)
IBPURD ($00E5)
PUPJ Disabled RDRIV ($000D) RDPJ
PUPK
PUPP
PUPS
TPU
PUPIB
Disabled RDRIV ($000D)
Disabled PWCTL ($0054)
Enabled SP0CR2 ($00D1)
Disabled TMSK2 ($008D)
Disabled IBPURD ($00E5)
RDPK
RDPP
RDPS
TDRB
RDPIB
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Technical Data
65
MC68HC912DT128A — Rev 4.0
Pinout and Signal Descriptions
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