AT80C51RD2-SLSUM Atmel, AT80C51RD2-SLSUM Datasheet - Page 32

MCU, 8BIT, 8051, 5V, SPI, 20MHZ, 44PLCC

AT80C51RD2-SLSUM

Manufacturer Part Number
AT80C51RD2-SLSUM
Description
MCU, 8BIT, 8051, 5V, SPI, 20MHZ, 44PLCC
Manufacturer
Atmel
Datasheets

Specifications of AT80C51RD2-SLSUM

Controller Family/series
(8051) 8052
No. Of I/o's
32
Ram Memory Size
1280Byte
Cpu Speed
40MHz
No. Of Timers
3
No. Of Pwm Channels
5
Core Size
8bit
Oscillator Type
External Only
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
+ 85 C
Mounting Style
SMD/SMT
Package / Case
PLCC
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Minimum Operating Temperature
- 40 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
Surface Mount
Pin Count
44
Package Type
PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT80C51RD2-SLSUM
Manufacturer:
Atmel
Quantity:
1 445
Part Number:
AT80C51RD2-SLSUM
Manufacturer:
Atmel
Quantity:
10 000
Figure 10-5. PCA High-speed Output Mode
10.4
32
Pulse Width Modulator Mode
CCAPnH
AT80C51RD2
Write to
1
CCA PnL
Write to
0
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, other-
wise an unwanted match could occur.
Once ECOM is set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t occur
while modifying the compare value. Writing to CCAPnH will set ECOM. For this reason, user
software should write CCAPnL first, and then CCAPnH. Of course, the ECOM bit can still be
controlled by accessing the CCAPMn register.
All of the PCA modules can be used as PWM outputs. Figure 10-6 shows the PWM function.
The frequency of the output depends on the source for the PCA timer. All of the modules will
have the same frequency of output because they all share the PCA timer. The duty cycle of each
module is independently variable using the module's capture register CCAPLn. When the value
of the PCA CL SFR is less than the value in the module's CCAPLn SFR the output will be low,
when it is equal to or greater than the output will be high. When CL overflows from FF to 00,
CCAPLn is reloaded with the value in CCAPHn. This allows updating the PWM without glitches.
The PWM and ECOM bits in the module's CCAPMn register must be set to enable the PWM
mode.
Reset
Enable
PCA counter/timer
CCAPnH
CH
16 bit comparator
CF
ECOMn
CCAPnL
CR
CL
CAPPn
Match
CAPNn MATn TOGn PWMn ECCFn
CCF4 CCF3 CCF2 CCF1 CCF0
CCON
0xD8
CCAPMn, n = 0 to 4
0xDA to 0xDE
PCA IT
CEXn
4113D–8051–01/09

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