MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 172
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MCF5272VF66
Manufacturer Part Number
MCF5272VF66
Description
Manufacturer
Freescale
Datasheet
1.MCF5272VF66.pdf
(544 pages)
Specifications of MCF5272VF66
Family Name
MCF5xxx
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
66MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
3.3V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
196
Package Type
MA-BGA
Lead Free Status / RoHS Status
Not Compliant
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System Integration Module (SIM)
If an interrupt timeout value is programmed in WIRR, and this value is reached prior to the reset timeout
value, WER[WIE] is set and a maskable interrupt is issued at the level defined by ICR4[SWTOIPL].
The software watchdog consists of a 15-bit counter with a 15-bit prescaler. It counts up to a maximum of
32768, with a resolution of 32768 clock periods. Thus, at 66 MHz, the resolution of the watchdog is 0.5
msec, with a maximum timeout period of 32768 * 32768 = 2
6.2.8.1
The watchdog reset reference register (WRRR),
watchdog timeout causing a reset.
Table 6-9
6.2.8.2
The watchdog interrupt reference register (WIRR),
software watchdog timeout causing an interrupt.
Table 6-10
6-12
15–1
Bits
0
Address
Address
Timeout = (WRRR +1) * 32768 clocks
Field
Reset
Reset
REF
EN
Field
Field
R/W
R/W
describes WRRR fields.
describes WIRR fields.
Watchdog Reset Reference Register (WRRR)
Watchdog Interrupt Reference Register (WIRR)
15
15
Reference value. This field determines the reset timeout value.Reset initializes this register to 0xFFFE,
disabling the watchdog timer and setting it to the maximum timeout value.
Enable watchdog. When enabled, software should periodically write to WCR to avoid reaching the reset
reference value.
0 Watchdog timer disabled.
1 Watchdog timer enabled.
MCF5272 ColdFire
Figure 6-9. Watchdog Interrupt Reference Register (WIRR)
Figure 6-8. Watchdog Reset Reference Register (WRRR)
Table 6-9. WRRR Field Descriptions
®
Integrated Microprocessor User’s Manual, Rev. 3
1111_1111_1111_1110
1111_1111_1111_1110
Figure
MBAR + 0x280
MBAR + 0x284
Figure
REF
REF
Description
R/W
R/W
6-8, contains the reference value for the software
6-9, contains the reference value for the
30
clock periods or 16.267 S.
Freescale Semiconductor
1
1
IEN
EN
0
0
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