MCF5270CAB100 Freescale Semiconductor, MCF5270CAB100 Datasheet - Page 398

• Manufacturer Part Number: MCF5270CAB100
• Description: MCU V2 COLDFIRE 64K SRAM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5270CAB100

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-QFP
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Watchdog Timer Module
20.2.1.2 Watchdog Modulus Register (WMR)
20.2.1.3 Watchdog Count Register (WCNTR)
20.2.1.4 Watchdog Service Register (WSR)
When the watchdog timer is enabled, writing 0x5555 and then 0xAAAA to WSR before the
watchdog counter times out prevents a reset. If WSR is not serviced before the timeout, the
watchdog timer sends a signal to the reset controller module that sets the RSR[WDR] bit and
asserts a system reset.
20-4
Address
Address
Reset
Reset
15–0
15–0
Bits
Bits
W
W
R
R
15
15
1
1
Name
Name
WM
14
14
WC
1
1
Figure 20-3. Watchdog Modulus Register (WMR)
Figure 20-4. Watchdog Count Register (WCNTR)
13
13
1
1
Watchdog modulus. Contains the modulus that is reloaded into the watchdog counter by a
service sequence. Once written, the WM[15:0] field is not affected by further writes except
in halted mode. Writing to WMR immediately loads the new modulus value into the
watchdog counter. The new value is also used at the next and all subsequent reloads.
Reading WMR returns the value in the modulus register.
Reset initializes the WM[15:0] field to 0xFFFF.
Note: The prescaler counter is reset anytime a new value is loaded into the watchdog
counter and also during reset.
Watchdog count field. Reflects the current value in the watchdog counter. Reading the
16-bit WCNTR with two 8-bit reads is not guaranteed to return a coherent value. Writing to
WCNTR has no effect, and write cycles are terminated normally.
Table 20-5. WCNTR Field Descriptions
12
12
1
1
Table 20-4. WMR Field Descriptions
11
11
1
1
MCF5271 Reference Manual, Rev. 2
10
10
1
1
IPSBAR + 0x14_0002
IPSBAR + 0x14_0004
1
1
9
9
1
1
8
8
WM
WC
Description
Description
1
1
7
7
6
1
6
1
1
1
5
5
1
1
4
4
1
1
3
3
Freescale Semiconductor
1
1
2
2
1
1
1
1
1
1
0
0