AT89C51RB2-RLTUM Atmel, AT89C51RB2-RLTUM Datasheet - Page 52

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

Specifications of AT89C51RB2-RLTUM

• 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-TQFP, 44-VQFP
• Cpu Family: 89C
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 60MHz
• Interface Type: SPI/UART
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• 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: 44
• Package Type: VQFP
• Package: 44VQFP
• Family Name: 89C
• Maximum Speed: 60 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Processor Series: AT89x
• Core: 8051
• Data Ram Size: 1.25 KB
• Maximum Clock Frequency: 60 MHz
• 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: Compliant

52
AT89C51RB2/RC2
Table 40. T2CON Register
T2CON - Timer 2 Control Register (C8h)
Reset Value = 0000 0000b
Bit addressable
Number
TF2
Bit
7
7
6
5
4
3
2
1
0
Mnemonic
CP/RL2#
EXF2
EXEN2
C/T2#
RCLK
EXF2
TCLK
TR2
Bit
TF2
6
Timer 2 overflow Flag
Must be cleared by software.
Set by hardware on timer 2 overflow, if RCLK = 0 and TCLK = 0.
Timer 2 External Flag
Set when a capture or a reload is caused by a negative transition on T2EX pin if
EXEN2=1.
When set, causes the CPU to vector to timer 2 interrupt routine when timer 2
interrupt is enabled.
Must be cleared by software. EXF2 doesn’t cause an interrupt in Up/down
counter mode (DCEN = 1)
Receive Clock bit for UART
Cleared to use timer 1 overflow as receive clock for serial port in mode 1 or 3.
Set to use timer 2 overflow as receive clock for serial port in mode 1 or 3.
Transmit Clock bit for UART
Cleared to use timer 1 overflow as transmit clock for serial port in mode 1 or 3.
Set to use timer 2 overflow as transmit clock for serial port in mode 1 or 3.
Timer 2 External Enable bit
Cleared to ignore events on T2EX pin for timer 2 operation.
Set to cause a capture or reload when a negative transition on T2EX pin is
detected, if timer 2 is not used to clock the serial port.
Timer 2 Run control bit
Cleared to turn off timer 2.
Set to turn on timer 2.
Timer/Counter 2 select bit
Cleared for timer operation (input from internal clock system: F
Set for counter operation (input from T2 input pin, falling edge trigger). Must be
0 for clock out mode.
Timer 2 Capture/Reload bit
If RCLK=1 or TCLK=1, CP/RL2# is ignored and timer is forced to auto-reload on
timer 2 overflow.
Cleared to auto-reload on timer 2 overflows or negative transitions on T2EX pin
if EXEN2=1.
Set to capture on negative transitions on T2EX pin if EXEN2=1.
RCLK
5
TCLK
4
EXEN2
3
Description
TR2
2
C/T2#
1
CLK PERIPH
4180E–8051–10/06
CP/RL2#
).
0