MC912D60ACPVE8 Datasheet, PDF (60/460 Pages) Freescale Semiconductor, Inc – MC68HC912D60A MC68HC912D60C MC68HC912D60P Technical Data

Pinout and Signal Descriptions
3.6.12 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
Enable Bit
Port
Resistive
Name Input Loads
Register
(Address)
Bit Name
Reset
State
Port A
Pull-up
PUCR ($000C) PUPA Disabled
Port B
Pull-up
PUCR ($000C) PUPB Disabled
Port E:
PE7,
PE[3:2]
Pull-up
PUCR ($000C) PUPE Enabled
PE[1:0]
Pull-up
PUCR ($000C) PUPE Enabled
PE[6:4]
None
—
Port G
Pull-up or
Pull-
down⁽¹⁾
PUCR ($000C)
PUPG
Enabled
Port H
Pull-up or
Pull-
down⁽²⁾
PUCR ($000C)
PUPH
Enabled
Port P
Pull-up
PWCONT ($0054) PUPP Disabled
PS[1:0]
Pull-up
PURDS ($00D9) PUPS0 Disabled
PS[3:2]
Pull-up
PURDS ($00D9) PUPS1 Disabled
PS[7:4]
Pull-up
PURDS ($00D9) PUPS2 Disabled
Port T
Pull-up
TMSK2 ($008D) PUPT Disabled
PortCAN[1]:
TxCAN
None
—
PortCAN[0]:
RxCAN
Pull-up
Always enabled
Port
CAN[7:2]
Pull-up
PCTLCAN
($013D)
PUPCAN Disabled
Port AD0 None
—
Port AD1 None
—
Reduced Drive Control Bit
Register
(Address)
Bit Name
Reset
State
RDRIV ($000D) RDPA Full drive
RDRIV ($000D) RDPB Full drive
RDRIV ($000D)
—
RDRIV ($000D)
RDPE
RDPE
Full drive
Full drive
RDRIV ($000D) RDPG Full drive
RDRIV ($000D) RDPH Full drive
PWCONT ($0054)
PURDS ($00DB)
PURDS ($00DB)
PURDS ($00DB)
TMSK2 ($008D)
RDPP
RDPS0
RDPS1
RDPS2
TDRB
—
Full drive
Full drive
Full drive
Full drive
Full drive
—
PCTLCAN ($013D) RDPCAN Full drive
—
—
1. Pull-Up when PGUPD input pin is high, Pull-down when PGUPD input pin is low.
In the 80-pin version, PGUPD is internally tied to VDD, hence PG4 is pulled up.
2. Pull-Up when PHUPD input pin is high, Pull-down when PHUPD input pin is low.
In the 80-pin version, PHUPD is internally tied to VSS, hence PH4 is pulled down.
Technical Data
60
Pinout and Signal Descriptions
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor