MC68332
SYSTEM INTEGRATION MODULE
USER’S MANUAL
4-43
4.6.5.2 Reset States of Pins Assigned to Other MCU Modules
As a rule, module pins that are assigned to general-purpose I/O ports go to active high-
impedance state following reset. Other pin states are determined by individual module
control register settings. Refer to sections concerning modules for details. However,
during power-up reset, module port pins may be in an indeterminate state for a short
4.6.6 Reset Timing
The RESET input must be asserted for a specified minimum period for reset to occur.
External RESET assertion can be delayed internally for a period equal to the longest
bus cycle time (or the bus monitor time-out period) in order to protect write cycles from
being aborted by reset. While RESET is asserted, SIM pins are either in an inactive,
high impedance state or are driven to their inactive states.
When an external device asserts RESET for the proper period, reset control logic
clocks the signal into an internal latch. The control logic drives the RESET pin low for
an additional 512 CLKOUT cycles after it detects that the RESET signal is no longer
being externally driven, to guarantee this length of reset to the entire system.
Table 4-18 SIM Pin Reset States
State While
Pin State After RESET Released
Mnemonic
RESET
Asserted
Pin
Function
Pin State
Pin
Function
Pin State
CS10/ADDR23
1
CS10
1
ADDR23
Unknown
CS[9:6]/ADDR[22:19]/PC[6:3]
1
CS[9:6]
1
ADDR[22:19]
Unknown
ADDR[18:0]
High-Z Output ADDR[18:0]
Unknown
ADDR[18:0]
Unknown
AS/PE5
High-Z Output
AS
Output
PE5
Input
AVEC/PE2
Disabled AVEC
Input
PE2
Input
BERR
Disabled BERR
Input
BERR
Input
CSM/BG
1
CSM
1
BG
1
CSE/BGACK
1
CSE
1
BGACK
Input
CS0/BR
1
CS0
1
BR
Input
CLKOUT
Output
CLKOUT
Output
CLKOUT
Output
CSBOOT
1
CSBOOT
0
CSBOOT
0
DATA[15:0]
Mode Select
DATA[15:0]
Input
DATA[15:0]
Input
DS/PE4
Disabled DS
Output
PE4
Input
DSACK0/PE0
Disabled DSACK0
Input
PE0
Input
DSACK1/PE1
Disabled DSACK1
Input
PE1
Input
CS5/FC2/PC2
1
CS5
1
FC2
Unknown
FC1/PC1
1
FC1
1
FC1
Unknown
CS3/FC0/PC0
1
CS3
1
FC0
Unknown
HALT
Disabled HALT
Input
HALT
Input
IRQ[7:1]/PF[7:1]
Disabled IRQ[7:1] Input
PF[7:1]
Input
MODCLK/PF0
Mode Select
MODCLK
Input
PF0
Input
R/W
Disabled
R/W
Output
R/W
Output
RESET
Asserted
RESET
Input
RESET
Input
RMC
Disabled
RMC
Output
PE3
Input
SIZ[1:0]/PE[7:6]
Disabled SIZ[1:0]
Unknown
PE[7:6]
Input
TSC
Mode Select
TSC
Input
TSC
Input
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Freescale Semiconductor, Inc.
For More Information On This Product,
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