MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 203

• Manufacturer Part Number: MC68HC711E20CFN2
• Description: IC MCU 20K 2MHZ OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E20CFN2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.7 Computer Operating Properly (COP) Watchdog Function
9.8 Pulse Accumulator
M68HC11E Family — Rev. 3.2
MOTOROLA
The clocking chain for the COP function, tapped off of the main timer
divider chain, is only superficially related to the main timer system. The
CR[1:0] bits in the OPTION register and the NOCOP bit in the CONFIG
register determine the status of the COP function. One additional
register, COPRST, is used to arm and clear the COP watchdog reset
system. Refer to
discussion of the COP function.
The M68HC11 Family of MCUs has an 8-bit counter that can be
configured to operate either as a simple event counter or for gated time
accumulation, depending on the state of the PAMOD bit in the PACTL
register. Refer to the pulse accumulator block diagram,
the event counting mode, the 8-bit counter is clocked to increasing
values by an external pin. The maximum clocking rate for the external
event counting mode is the E clock divided by two. In gated time
accumulation mode, a free-running E-clock divide-by-64 signal drives
the 8-bit counter, but only while the external PAI pin is activated. Refer to
Table
time.
9-6. The pulse accumulator counter can be read or written at any
Section 5. Resets and Interrupts
Timing System
Computer Operating Properly (COP) Watchdog Function
for a more detailed
Figure
Timing System
Technical Data
9-24. In
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