AT89C51RE2-SLRUM Atmel, AT89C51RE2-SLRUM Datasheet - Page 69

• Manufacturer Part Number: AT89C51RE2-SLRUM
• Description: MCU 8051 128K FLASH 44-PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RE2-SLRUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89OCD-01
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Mode 0 (13-bit Timer)
Figure 23. Timer/Counter x (x = 0 or 1) in Mode 0
Mode 1 (16-bit Timer)
Figure 24. Timer/Counter x (x = 0 or 1) in Mode 1
7663E–8051–10/08
INTx#
See the “Clock” section
INTx#
See the “Clock” section
CLOCK
CLOCK
FTx
Tx
FTx
Tx
TMOD reg
GATEx
TMOD reg
GATEx
÷ 6
÷ 6
Mode 0 configures Timer 0 as an 13-bit Timer which is set up as an 8-bit Timer (TH0 register)
with a modulo 32 prescaler implemented with the lower five bits of TL0 register (see Figure 23).
The upper three bits of TL0 register are indeterminate and should be ignored. Prescaler overflow
increments TH0 register.
Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in cascade
(see Figure 24). The selected input increments TL0 register.
TMOD reg
TMOD reg
C/Tx#
C/Tx#
0
1
0
1
TCON reg
TCON reg
TRx
TRx
(8 bits)
(8 bits)
THx
THx
(8 bits)
(5 bits)
TLx
TLx
Overflow
Overflow
TCON reg
TCON reg
TFx
TFx
AT89C51RE2
Timer x
Interrupt
Request
Timer x
Interrupt
Request
69