AT89S51-24PU Atmel, AT89S51-24PU Datasheet - Page 8

IC MCU 4K FLASH 24MHZ 40-DIP

AT89S51-24PU

Manufacturer Part Number
AT89S51-24PU
Description
IC MCU 4K FLASH 24MHZ 40-DIP
Manufacturer
Atmel
Series
89Sr
Datasheets

Specifications of AT89S51-24PU

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
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
ISP/UART
Maximum Clock Frequency
24 MHz
Number Of Programmable I/os
32
Number Of Timers
2
Operating Supply Voltage
4 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89ISP
Minimum Operating Temperature
- 40 C
Controller Family/series
(8051) 8052
No. Of I/o's
32
Ram Memory Size
128Byte
Cpu Speed
24MHz
No. Of Timers
2
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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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

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