MC68331CEH16 Datasheet, PDF (17/84 Pages) Freescale Semiconductor, Inc – 32-Bit Modular Microcontroller

Freescale Semiconductor, Inc.
RESET STATUS
HALT MONITOR
RESET REQUEST
BUS MONITOR
BERR
SPURIOUS INTERRUPT MONITOR
CLOCK
PRESCALER
2⁹
SOFTWARE WATCHDOG TIMER
PERIODIC INTERRUPT TIMER
RESET REQUEST
IRQ[7:1]
Figure 6 System Configuration and Protection Block
300 SYS PROTECT BLOCK
3.2.1 System Configuration
The SIM controls MCU configuration during normal operation and during internal testing.
SIMCR —SIM Configuration Register
$YFFA00
15
14
13
12
11
10
9
8
7
6
5
4
3
0
EXOFF FRZSW FRZBM 0 SLVEN 0
SHEN
SUPV MM
0
0
IARB
RESET:
0
0
0
0 DATA11 0
0
0
1
1
0
0
1
1
1
1
The SIM configuration register controls system configuration. It can be read or written at any time, ex-
cept for the module mapping (MM) bit, which can be written only once.
EXOFF —External Clock Off
0 = The CLKOUT pin is driven from an internal clock source.
1 = The CLKOUT pin is placed in a high-impedance state.
FRZSW —Freeze Software Enable
0 = When FREEZE is asserted, the software watchdog and periodic interrupt timer counters con-
tinue to run.
1 = When FREEZE is asserted, the software watchdog and periodic interrupt timer counters are dis-
abled, preventing interrupts during software debug.
FRZBM —Freeze Bus Monitor Enable
0 = When FREEZE is asserted, the bus monitor continues to operate.
1 = When FREEZE is asserted, the bus monitor is disabled.
MC68331TS/D
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