AT89C5131A-S3SUL Atmel, AT89C5131A-S3SUL Datasheet - Page 156

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

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

WDT During Power-down
and Idle
156
AT89C5131A-L
Table 110. WDTPRG Register
WDTPRG - Watchdog Timer Out Register (0A7h)
Reset value = XXXX X000
In Power-down mode the oscillator stops, which means the WDT also stops. While in
Power-down mode the user does not need to service the WDT. There are 2 methods of
exiting Power-down mode: by a hardware reset or via a level activated external interrupt
which is enabled prior to entering Power-down mode. When Power-down is exited with
hardware reset, servicing the WDT should occur as it normally should whenever the
AT89C5131A-L is reset. Exiting Power-down with an interrupt is significantly different.
The interrupt is held low long enough for the oscillator to stabilize. When the interrupt is
brought high, the interrupt is serviced. To prevent the WDT from resetting the device
while the interrupt pin is held low, the WDT is not started until the interrupt is pulled high.
It is suggested that the WDT be reset during the interrupt service routine.
To ensure that the WDT does not overflow within a few states of exiting of power-down,
it is better to reset the WDT just before entering power-down.
In the Idle mode, the oscillator continues to run. To prevent the WDT from resetting the
AT89C5131A-L while in Idle mode, the user should always set up a timer that will peri-
odically exit Idle, service the WDT, and re-enter Idle mode.
Number
Bit
7
6
5
4
3
2
1
0
7
-
Mnemonic
Bit
S2
S1
S0
-
-
-
-
-
6
-
Description
Reserved
The value read from this bit is undetermined. Do not try to set this bit.
WDT Time-out select bit 2
WDT Time-out select bit 1
WDT Time-out select bit 0
S2 S1 S0 Selected Time-out
0
0
0
0
1
1
1
1
16384x2^S machine cycles
0
0
1
1
0
0
1
1
5
-
0
1
0
1
0
1
0
1
16384x2^(214 - 1) machine cycles, 16.3 ms at FOSC = 12 MHz
16384x2^(215 - 1) machine cycles, 32.7 ms at FOSC = 12 MHz
16384x2^(216 - 1) machine cycles, 65.5 ms at FOSC = 12 MHz
16384x2^(217 - 1) machine cycles, 131 ms at FOSC = 12 MHz
16384x2^(218 - 1) machine cycles, 262 ms at FOSC = 12 MHz
16384x2^(219 - 1) machine cycles, 542 ms at FOSC = 12 MHz
16384x2^(220 - 1) machine cycles, 1.05 s at FOSC = 12 MHz
16384x2^(221 - 1) machine cycles, 2.09 s at FOSC = 12 MHz
4
-
3
-
S2
2
S1
1
4338F–USB–08/07
S0
0