AT89C5131A-S3SUL Atmel, AT89C5131A-S3SUL Datasheet - Page 65

MCU 8051 32K FLASH USB 52-PLCC

AT89C5131A-S3SUL

Manufacturer Part Number
AT89C5131A-S3SUL
Description
MCU 8051 32K FLASH USB 52-PLCC
Manufacturer
Atmel
Series
AT89C513xr
Datasheets

Specifications of AT89C5131A-S3SUL

Core Processor
C52X2
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
LED, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-PLCC
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
1.25 KB
Interface Type
2-Wire, EUART, SPI, USB
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
34
Number Of Timers
3 bit
Operating Supply Voltage
3 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89STK-05
Minimum Operating Temperature
- 40 C
For Use With
AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
 Details

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT89C5131A-S3SUL
Manufacturer:
Atmel
Quantity:
10 000
PCA Watchdog Timer
4338F–USB–08/07
Figure 33. PCA PWM Mode
An on-board watchdog timer is available with the PCA to improve the reliability of the
system without increasing chip count. Watchdog timers are useful for systems that are
susceptible 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. Figure 31 shows a diagram of how
the watchdog works. 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 low.
In order to hold off the reset, the user has three options:
1. Periodically change the compare value so it will never match the PCA timer
2. Periodically change the PCA timer value so it will never match the compare val-
3. Disable the watchdog by clearing the WDTE bit before a match occurs and then
The first two options are more reliable because the watchdog timer is never disabled as
in option #3. If the program counter ever goes astray, a match will eventually occur and
cause an internal reset. The second option is also not recommended if other PCA mod-
ules are being used. 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.
This watchdog timer won’t generate a reset out on the reset pin.
ues, or
re-enable it
ECOMn
CAPPn
Enable
CAPNn MATn TOGn PWMn ECCFn
Overflow
PCA Counter/Timer
8-bit Comparator
CCAPnH
CCAPnL
CL
<
CCAPMn, n = 0 to 4
0xDA to 0xDE
“1”
“0”
CEXn
65

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