AT89C51RB2-SLSIM Atmel, AT89C51RB2-SLSIM Datasheet - Page 83

• Manufacturer Part Number: AT89C51RB2-SLSIM
• Description: IC 8051 MCU FLASH 16K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RB2-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Figure 34. Power-down Exit Waveform
Table 62. State of Ports
4180E–8051–10/06
Power Down
Power Down
Mode
Idle
Idle
or
XTALB
XTALA
INT0
INT1
Program Memory
Active Phase
External
External
Internal
Internal
be the one following the instruction that puts the AT89C51RB2/RC2 into Power-down
mode.
Exit from Power-down by reset redefines all the SFRs, exit from Power-down by exter-
nal interrupt does no affect the SFRs.
Exit from Power-down by either reset or external interrupt or keyboard interrupt does not
affect the internal RAM content.
Note:
Table 62 shows the state of ports during idle and power-down modes.
Port 0 can force a 0 level. A "one" will leave port floating.
ALE
If idle mode is activated with Power-down mode (IDL and PD bits set), the exit sequence
is unchanged, when execution is vectored to interrupt, PD and IDL bits are cleared and
idle mode is not entered.
1
1
0
0
Power-down Phase
PSEN
1
0
0
1
Port Data
Port Data
Oscillator Restart Phase
PORT0
Floating
Floating
(1)
(1)
Port Data
Port Data
Port Data
Port Data
PORT1
AT89C51RB2/RC2
Active Phase
Port Data
Port Data
Port Data
PORT2
Address
Port Data
Port Data
Port Data
Port Data
PORT3
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