Datasheet

Pinout and Signal Description
MC9S12DP256 — Revision 1.1
Pinout and Signal Description
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 9 summarizes the port pull-up default
status and controls.
Table 9 Port A, B, E, K, PAD0&1 Pull-Up, Pull-Down and Reduced Drive Summary
Enable Bit Reduced Drive Control Bit
Port
Name
Resistive
Input Loads
Register
(Address)
Bit Name
Reset
State
Register
(Address)
Bit Name
Reset
State
Port A Pull-up
PUCR
($000C)
PUPA Disabled
RDRIV
($000D)
RDPA Full drive
Port B Pull-up
PUCR
($000C)
PUPB Disabled
RDRIV
($000D)
RDPB Full drive
Port E:
PE7, PE[4:0] Pull-up
PUCR
($000C)
PUPE Enabled
RDRIV
($000D)
RDPE Full drive
PE[6:5] Pull-down — — Enabled
RDRIV
($000D)
RDPE Full drive
Port K[7], Port
K[5:0]
Pull-up
PUCR
($000C)
PUPKE Enabled
RDRIV
($000D)
RDPK Full drive
Port ATD0[7:0] None —
Port ATD1[7:0] None —
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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