AT89S51-24JC Atmel, AT89S51-24JC Datasheet - Page 8
AT89S51-24JC
Manufacturer Part Number
AT89S51-24JC
Description
IC 8051 MCU 4K FLASH 44PLCC
Manufacturer
Atmel
Series
89Sr
Datasheet
1.AT89S51-24JU.pdf
(31 pages)
Specifications of AT89S51-24JC
Core Processor
8051
Core Size
8-Bit
Speed
24MHz
Connectivity
UART/USART
Peripherals
WDT
Number Of I /o
32
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89S51-24JC
Manufacturer:
ATM
Quantity:
1 025
Company:
Part Number:
AT89S51-24JC
Manufacturer:
ATMEL
Quantity:
3 398
Part Number:
AT89S51-24JC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
8
AT89S51
Table 5-2.
Dual Data Pointer Registers: To facilitate accessing both internal and external data memory,
two banks of 16-bit Data Pointer Registers are provided: DP0 at SFR address locations 82H-
83H and DP1 at 84H-85H. Bit DPS = 0 in SFR AUXR1 selects DP0 and DPS = 1 selects DP1.
The user should ALWAYS initialize the DPS bit to the appropriate value before accessing the
respective Data Pointer Register.
Power Off Flag: The Power Off Flag (POF) is located at bit 4 (PCON.4) in the PCON SFR. POF
is set to “1” during power up. It can be set and rest under software control and is not affected by
reset.
AUXR
Bit
–
DISALE
DISRTO
WDIDLE
WDIDLE
0
1
Not Bit Addressable
Reserved for future expansion
Disable/Enable ALE
DISALE
Operating Mode
0
1
Disable/Enable Reset-out
DISRTO
0
1
Disable/Enable WDT in IDLE mode
AUXR: Auxiliary Register
WDT continues to count in IDLE mode
WDT halts counting in IDLE mode
–
7
Address = 8EH
ALE is emitted at a constant rate of 1/6 the oscillator frequency
ALE is active only during a MOVX or MOVC instruction
Reset pin is driven High after WDT times out
Reset pin is input only
–
6
–
5
WDIDLE
4
DISRTO
3
–
2
Reset Value = XXX00XX0B
–
1
DISALE
2487D–MICRO–6/08
0