AT89C51CC03C-RDTIM Atmel, AT89C51CC03C-RDTIM Datasheet - Page 83

• Manufacturer Part Number: AT89C51CC03C-RDTIM
• Description: IC 8051 MCU FLASH 64K 64VQFP
• Manufacturer: Atmel
• Series: AT89C CANr

Specifications of AT89C51CC03C-RDTIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2.25K 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: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT89C51CC03CRDTIM

Watchdog Programming
4182E–CAN–05/04
The three lower bits (S0, S1, S2) located into WDTPRG register permit to program the
WDT duration.
Table 42. Machine Cycle Count
To compute WD Time-Out, the following formula is applied:
Note:
The following table outlines the time-out value for Fosc
Table 43. Time-Out Computation
S2
0
0
0
0
1
1
1
1
S2
0
0
0
0
1
1
1
1
Svalue represents the decimal value of (S2 S1 S0)
F T i m e O u t
S1
0
0
1
1
0
0
1
1
–
S1
0
0
1
1
0
0
1
1
=
S0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
12
0
1
0
1
0
1
0
1
×
(
(
S0
2
0
1
0
1
0
1
0
1
14
Fosc = 12 MHz
F
×
131.07 ms
262.14 ms
524.29 ms
16.38 ms
32.77 ms
65.54 ms
w d
2
1.05 s
2.10 s
S v a l u e
) 1
–
)
XTAL
Fosc = 16 MHz
Machine Cycle Count
196.56 ms
393.12 ms
786.24 ms
12.28 ms
24.57 ms
49.14 ms
98.28 ms
1.57 s
= 12 MHz in X1 mode
AT89C51CC03
2
2
2
2
2
2
2
2
14
15
17
18
19
20
21
16
- 1
- 1
- 1
- 1
- 1
- 1
- 1
- 1
Fosc = 20 MHz
157.28 ms
314.56 ms
629.12 ms
19.66 ms
39.32 ms
78.64 ms
9.82 ms
1.25 ms
83