mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 36

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.6.5 Port Pullup, Pulldown, and Reduced Drive
MCU ports can be configured for internal pullup. 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.
1-5
36
Port A
Port B
Port E
PE7, PE3, PE2,
PE1, PE0
Port E
PE4
Port E
PE6, PE5
Port P
Port S
PS1–PS0
Port S
PS3–PS2
Port S
PS7–PS4
Port T
Port DLC/PCAN
Port AD
BKGD
1. Port DLC applies to the MC68HC912B32 and MC68HC12BE32 and PCAN to the MC68HC(9)12BC32.
summarizes the port pullup default status and controls.
Name
Port
(1)
Table 1-5. Port Pullup, Pulldown, and Reduced Drive Summary
Input Loads
Resistive
Pulldown
Pullup
Pullup
Pullup
Pullup
Pullup
Pullup
Pullup
Pullup
Pullup
Pullup
None
None
M68HC12B Family Data Sheet, Rev. 9.1
(Address)
DLCSCR
Register
($00DB)
($00DB)
($00DB)
($00FD)
($000C)
($000C)
($000C)
($008D)
PWCTL
($0054)
PURDS
PURDS
PURDS
TMSK2
PUCR
PUCR
PUCR
—
Enabled during reset
Enable Bit
DLCPUE
PUPS0
PUPS1
PUPS2
Name
PUPB
PUPE
PUPP
PUPA
PUPT
—
—
Bit
—
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
Reset
State
(Address)
DLCSCR
Register
($00DB)
($00DB)
($00DB)
($00FD)
($000D)
($000D)
($000D)
($000D)
PWCTL
PURDS
PURDS
PURDS
($008D)
($0054)
TMSK2
RDRIV
RDRIV
RDRIV
RDRIV
—
—
Reduced Drive Control Bit
Freescale Semiconductor
DLCRDV
RDPS0
RDPS1
RDPS2
RDPE
RDPE
Name
RDPA
RDPB
RDPP
RDPT
—
Bit
—
—
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Full drive
Reset
State
—
Table