AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 176

• Manufacturer Part Number: AT89C5122D-PSTUM
• Description: IC 8051 MCU FLASH 32K 64QFN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-PSTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: SmartCard, SPI, UART/USART, USB
• Peripherals: LED, POR, WDT
• Number Of I /o: 46
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFN
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

176
AT83R5122, AT8xC5122/23
Table 109. Watchdog Timer Out Register - WDTPRG (0A7h)
Reset Value = XXXX X000b
The three lower bits (S0, S1, S2) located into WDTPRG register enables to program the
WDT duration.
Table 110. Machine Cycle Count
To compute WD Timeout, the following formula must be applied:
Note:
Number
7 - 3
Bit
7
2
1
0
-
S2
0
0
0
0
1
1
1
1
Svalue represents the decimal value of (S2 S1 S0)
Mnemonic
Bit
6
S2
S1
S0
-
-
S1
0
0
1
1
0
0
1
1
Time Out = 6 * (2
Description
Reserved
The value read from this bit is indeterminate. Do not change these bits.
WDT Time-out select bit 2
WDT Time-out select bit 1
WDT Time-out select bit 0
5
-
S0
0
1
0
1
0
1
0
1
4
-
14
* 2
Svalue
3
-
- 1 ) / F
Machine Cycle Count
CK_WD
S2
2
2
2
2
2
2
2
2
2
14
15
17
18
19
20
21
16
- 1
- 1
- 1
- 1
- 1
- 1
- 1
- 1
S1
1
4202F–SCR–07/2008
S0
0