AT89C51RB2-3CSUL Atmel, AT89C51RB2-3CSUL Datasheet - Page 31
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AT89C51RB2-3CSUL
Manufacturer Part Number
AT89C51RB2-3CSUL
Description
MCU 8051 16K FLASH 3V 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51RB2-RLTIL.pdf
(127 pages)
Specifications of AT89C51RB2-3CSUL
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
16KB (16K 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
Mounting Style
Through Hole
3rd Party Development Tools
PK51, CA51, A51, ULINK2
For Use With
AT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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