AT89C51RC2-SLSUL Atmel, AT89C51RC2-SLSUL Datasheet - Page 31

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

Specifications of AT89C51RC2-SLSUL

• 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-PLCC
• 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
• Package: 44PLCC
• Device Core: 80C51
• Family Name: AT89
• Maximum Speed: 40 MHz
• 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

Programmable
Counter Array (PCA)
4180E–8051–10/06
The PCA provides more timing capabilities with less CPU intervention than the standard
timer/counters. Its advantages include reduced software overhead and improved accu-
racy. The PCA consists of a dedicated timer/counter which serves as the time base for
an array of five compare/capture Modules. Its clock input can be programmed to count
any one of the following signals:
•
•
•
•
Each compare/capture Modules can be programmed in any one of the following modes:
•
•
•
•
Module 4 can also be programmed as a watchdog timer (see Section "PCA Watchdog
Timer", page 42).
When the compare/capture Modules are programmed in the capture mode, software
timer, or high speed output mode, an interrupt can be generated when the Module exe-
cutes its function. All five Modules plus the PCA timer overflow share one interrupt
vector.
The PCA timer/counter and compare/capture modules share Port 1 for external I/O.
These pins are listed below. If one or several bits in the port are not used for the PCA,
they can still be used for standard I/O.
The PCA timer is a common time base for all five Modules (see Figure 11). The timer
count source is determined from the CPS1 and CPS0 bits in the CMOD register
(Table 22) and can be programmed to run at:
•
•
•
•
Peripheral clock frequency (F
Peripheral clock frequency (F
Timer 0 overflow
External input on ECI (P1.2)
Rising and/or falling edge capture
Software timer
High-speed output
Pulse width modulator
1/6 the
1/2 the
The Timer 0 overflow
The input on the ECI pin (P1.2)
peripheral clock frequency (F
peripheral clock frequency (F
PCA Component
16-bit Module 0
16-bit Module 1
16-bit Module 2
16-bit Module 3
16-bit Counter
CLK PERIPH
CLK PERIPH
)
)
CLK PERIPH
CLK PERIPH
÷
÷
2
6
AT89C51RB2/RC2
)
)
External I/O Pin
P1.3/CEX0
P1.4/CEX1
P1.5/CEX2
P1.6/CEX3
P1.2/ECI
31