AT89C51RC2-RLTUL Atmel, AT89C51RC2-RLTUL Datasheet - Page 14

• Manufacturer Part Number: AT89C51RC2-RLTUL
• Description: IC 8051 MCU FLASH 32K 44VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RC2-RLTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1280 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• 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
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Oscillator
Registers
14
AT89C51RB2/RC2
To optimize the power consumption and execution time needed for a specific task, an
internal, prescaler feature has been implemented between the oscillator and the CPU
and peripherals.
Table 13. CKRL Register
CKRL – Clock Reload Register (97h)
Reset Value = 1111 1111b
Not bit addressable
Table 14. PCON Register
PCON – Power Control Register (87h)
Reset Value = 00X1 0000b Not bit addressable
SMOD1
CKRL7
Bit Number
Bit Number
7
7
7:0
7
6
5
4
3
2
1
0
SMOD0
CKRL6
6
6
Bit Mnemonic
Mnemonic
SMOD1
SMOD0
CKRL
POF
GF1
GF0
IDL
PD
-
CKRL5
5
-
5
Description
Clock Reload Register
Prescaler value
Description
Serial Port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3.
Serial Port Mode bit 0
Cleared to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Power-off Flag
Cleared to recognize next reset type.
Set by hardware when V
also be set by software.
General-purpose Flag
Cleared by software for general-purpose usage.
Set by software for general-purpose usage.
General-purpose Flag
Cleared by software for general-purpose usage.
Set by software for general-purpose usage.
Power-down Mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle Mode bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
CKRL4
POF
4
4
CKRL3
GF1
3
3
CC
rises from 0 to its nominal voltage. Can
CKRL2
GF0
2
2
CKRL1
PD
1
1
4180E–8051–10/06
CKRL0
IDL
0
0