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MC9S12E256 Datasheet, PDF (161/602 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers | |||
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Chapter 3 Port Integration Module (PIM9E256V1)
3.5 Resets
The reset values of all registers are given in the register description in Section 3.3, âMemory Map and
Register Definitionâ.
All ports start up as general-purpose inputs on reset.
3.5.1 Reset Initialization
All registers including the data registers get set/reset asynchronously. Table 3-37 summarizes the port
properties after reset initialization.
P
Table 3-37. Port Reset State Summary
Port
A
B
E
K
BKGD pin
AD
M[7:4]
M[3,1:0]
P
Q
S
T
U
Data
Direction
Refer to
Chapter 18,
âMultiplexed
External Bus
Interface
(MEBIV3)â
Input
Input
Input
Input
Input
Input
Input
Input
Pull Mode
Pull Up
Reset States
Red. Drive
Wired-OR
Mode
Interrupt
Refer to Chapter 18, âMultiplexed External Bus
Interface (MEBIV3)â
Hi-z
Pull Up
Hi-z
Hi-z
Hi-z
Pull Up
Hi-z
Hi-z
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
N/A
Disabled
Disabled
N/A
N/A
Disabled
N/A
N/A
Disabled
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MC9S12E256 Data Sheet, Rev. 1.08
Freescale Semiconductor
161
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