AT89C51RC2-RLTIL Atmel, AT89C51RC2-RLTIL Datasheet - Page 84
AT89C51RC2-RLTIL
Manufacturer Part Number
AT89C51RC2-RLTIL
Description
8-bit Microcontrollers - MCU 80C31 w/4k
Manufacturer
Atmel
Datasheet
1.AT89C51RC2-RLTIL.pdf
(127 pages)
Specifications of AT89C51RC2-RLTIL
Product Category
8-bit Microcontrollers - MCU
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
60 MHz
Program Memory Size
32 KB
Data Ram Size
1280 B
On-chip Adc
No
Operating Supply Voltage
2.7 V to 5.5 V
Package / Case
VQFP-44
Mounting Style
SMD/SMT
Interface Type
SPI, UART
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
32
Number Of Timers
3
Program Memory Type
Flash
Supply Voltage - Max
3.6 V
Supply Voltage - Min
2.7 V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51RC2-RLTIL
Manufacturer:
ATMEL
Quantity:
5 000
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Power-off Flag
84
AT89C51RB2/RC2
The Power-off flag allows the user to distinguish between a “cold start” reset and a
“warm start” reset.
A cold start reset is the one induced by V
V
The Power-off flag (POF) is located in PCON register (Table 63). POF is set by hard-
ware when V
software allowing the user to determine the type of reset.
Table 63. PCON Register
PCON - Power Control Register (87h)
Reset Value = 00X1 0000b
Not bit addressable
CC
Number
SMOD1
Bit
is still applied to the device and could be generated by an exit from Power-down.
7
7
6
5
4
3
2
1
0
Mnemonic Description
SMOD0
CC
SMOD1
SMOD0
POF
GF1
GF0
Bit
IDL
PD
6
-
rises from 0 to its nominal voltage. The POF can be set or cleared by
Serial port Mode Bit 1
Set to select double baud rate in mode 1, 2 or 3.
Serial port Mode Bit 0
Cleared to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Power-off Flag
Cleared to recognize next reset type.
Set by hardware when V
software.
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
Power-down mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle Mode Bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
5
-
POF
4
CC
CC
rises from 0 to its nominal voltage. Can also be set by
switch-on. A warm start reset occurs while
GF1
3
GF0
2
PD
1
4180E–8051–10/06
IDL
0
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