AT89C51IC2-SLRIL Atmel, AT89C51IC2-SLRIL Datasheet - Page 29
AT89C51IC2-SLRIL
Manufacturer Part Number
AT89C51IC2-SLRIL
Description
IC MCU FLASH 8051 32K 3V 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51IC2-SLRIM.pdf
(147 pages)
Specifications of AT89C51IC2-SLRIL
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K 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
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C51IC2SLRILTR
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4301D–8051–02/08
Table 23. AUXR Register
AUXR - Auxiliary Register (8Eh)
Reset Value = XX0X 00’HSB.XRAM’0b
Not bit addressable
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic Description
EXTRAM
XRS1
XRS0
Bit
AO
M0
6
-
-
-
-
Reserved
Reserved
Pulse length
Cleared to stretch MOVX control: the RD/ and the WR/ pulse length is 6 clock
periods (default).
Set to stretch MOVX control: the RD/ and the WR/ pulse length is 30 clock
periods.
Reserved
The value read from this bit is indeterminate. Do not set this bit
XRAM Size
XRS1
0
0
1
1
EXTRAM bit
Cleared to access internal XRAM using movx @ Ri/ @ DPTR.
Set to access external memory.
Programmed by hardware after Power-up regarding Hardware Security Byte
(HSB), default setting, XRAM selected.
ALE Output bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if
X2 mode is used) (default) Set, ALE is active only during a MOVX or MOVC
instruction is used.
The value read from this bit is indeterminate. Do not set this bit
The value read from this bit is indeterminate. Do not set this bit
M0
5
0
1
0
1
XRS0
4
-
XRAM size
256 bytes (default)
512 bytes
768 bytes
1024 bytes
XRS1
3
XRS0
2
EXTRAM
1
AO
0
29
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