AT89C51ED2-RDTUM Atmel, AT89C51ED2-RDTUM Datasheet - Page 85

IC 8051 MCU FLASH 64K 64VQFP

AT89C51ED2-RDTUM

Manufacturer Part Number
AT89C51ED2-RDTUM
Description
IC 8051 MCU FLASH 64K 64VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet

Specifications of AT89C51ED2-RDTUM

Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
50
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
UART, SPI
Maximum Clock Frequency
60 MHz
Number Of Programmable I/os
50
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Minimum Operating Temperature
- 40 C
Cpu Family
AT89
Device Core
8051
Device Core Size
8b
Frequency (max)
40MHz
Total Internal Ram Size
2KB
# I/os (max)
50
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
64
Package Type
VQFP
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
 Details

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19.2
4235K–8051–05/08
WDT during Power-down and Idle
Table 19-2.
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 AT89C51RD2/ED2 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 powerdown, it is bet-
ter to reset the WDT just before entering powerdown.
In the Idle mode, the oscillator continues to run. To prevent the WDT from resetting the
AT89C51RD2/ED2 while in Idle mode, the user should always set up a timer that will periodically
exit Idle, service the WDT, and re-enter Idle mode.
Number
Bit
7
6
5
4
3
2
1
0
7
-
Mnemonic
WDTPRG Register
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 S0Selected Time-out
0
0
0
0
1
1
1
1
00
01
10 (2
11
00
01 (2
10
11
5
-
16
19
(2
(2
- 1) machine cycles, 65. 5 ms @ F
(2
(2
- 1) machine cycles, 542 ms @ F
(2
(2
14
15
17
18
20
21
- 1) machine cycles, 16. 3 ms @ F
- 1) machine cycles, 32.7 ms @ F
- 1) machine cycles, 131 ms @ F
- 1) machine cycles, 262 ms @ F
- 1) machine cycles, 1.05 ms @ F
- 1) machine cycles, 2.09 ms @ F
4
-
3
-
OSCA
AT89C51RD2/ED2
OSCA
OSCA
OSCA
=12 MHz
S2
OSCA
OSCA
OSCA
2
OSCA
=12 MHz
=12 MHz
=12 MHz
=12 MHz
=12 MHz
=12 MHz
=12 MHz
S1
1
S0
0
85

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