AT80C51RD2-3CSUM Atmel, AT80C51RD2-3CSUM Datasheet - Page 22

• Manufacturer Part Number: AT80C51RD2-3CSUM
• Description: IC, 8BIT MCU, 80C51, 40MHZ, DIP-40
• Manufacturer: Atmel

Specifications of AT80C51RD2-3CSUM

• Controller Family/series: 80C51
• No. Of I/o's: 32
• Ram Memory Size: 1280Byte
• Cpu Speed: 40MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 5
• Digital Ic Case Style: DIP
• Core Size: 8 Bit
• Rohs Compliant: Yes
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: ROMLess
• 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: + 70 C
• Mounting Style: Through Hole
• Package / Case: PDIL-40
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Cpu Family: AT80
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Program Memory Size: Not Required
• 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: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10. Programmable Counter Array (PCA)
22
AT80C51RD2
The PCA provides more timing capabilities with less CPU intervention than the standard
timer/counters. Its advantages include reduced software overhead and improved accuracy. 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 33).
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 executes 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 the port is not used for the PCA, it can still be used for standard I/O.
The PCA timer is a common time base for all five modules (see Figure 10-1). The timer count
source is determined from the CPS1 and CPS0 bits in the CMOD register (Table 10-1) 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
)
)
External I/O Pin
P1.3/CEX0
P1.4/CEX1
P1.5/CEX2
P1.6/CEX3
P1.2/ECI
4113D–8051–01/09