T89C51CC01UA-RLTIM Atmel, T89C51CC01UA-RLTIM Datasheet - Page 123
T89C51CC01UA-RLTIM
Manufacturer Part Number
T89C51CC01UA-RLTIM
Description
IC 8051 MCU FLASH 32K 44VQFP
Manufacturer
Atmel
Series
AT89C CANr
Datasheets
1.T89C51CC01CA-7CTIM.pdf
(167 pages)
2.T89C51CC01CA-7CTIM.pdf
(12 pages)
3.T89C51CC01CA-7CTIM.pdf
(32 pages)
4.T89C51CC01CA-7CTIM.pdf
(29 pages)
Specifications of T89C51CC01UA-RLTIM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
For Use With
AT89STK-06 - KIT DEMOBOARD 8051 MCU W/CAN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
T89C51CC01UARLTIM
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Figure 58. PCA PWM Mode
PCA Watchdog Timer
4129N–CAN–03/08
CL rolls over from FFh TO 00h loads
CCAPnH contents into CCAPnL
CL (8 bits)
An on-board Watchdog timer is available with the PCA to improve system reliability with-
out increasing chip count. Watchdog timers are useful for systems that are sensitive to
noise, power glitches, or electrostatic discharge. Module 4 is the only PCA module that
can be programmed as a Watchdog. However, this module can still be used for other
modes if the Watchdog is not needed. The user pre-loads a 16-bit value in the compare
registers. Just like the other compare modes, this 16-bit value is compared to the PCA
timer value. If a match is allowed to occur, an internal reset will be generated. This will
not cause the RST pin to be driven high.
To hold off the reset, the user has three options:
•
•
•
The first two options are more reliable because the Watchdog timer is never disabled as
in the third option. If the program counter ever goes astray, a match will eventually occur
and cause an internal reset. If other PCA modules are being used the second option not
recommended either. Remember, the PCA timer is the time base for all modules;
changing the time base for other modules would not be a good idea. Thus, in most appli-
cations the first solution is the best option.
periodically change the compare value so it will never match the PCA timer,
periodically change the PCA timer value so it will never match the compare values,
or
disable the Watchdog by clearing the WDTE bit before a match occurs and then re-
enable it.
CCAPMn.6
ECOMn
8-Bit
Comparator
CCAPnL
CCAPnH
CCAPMn.1
PWMn
CL > = CCAPnL
CL < CCAPnL
“0”
“1”
CEX
123
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