AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 22

• Manufacturer Part Number: AT89C5122D-PSTUM
• Description: IC 8051 MCU FLASH 32K 64QFN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-PSTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: SmartCard, SPI, UART/USART, USB
• Peripherals: LED, POR, WDT
• Number Of I /o: 46
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFN
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

Registers
22
AT83R5122, AT8xC5122/23
Table 5. Auxiliary Register - AUXR (8Eh)
Reset Value = 0XXX X000b
Number
Bit
DPU
6-3
7
2
1
0
7
Mnemonic Description
EXTRAM
XRS0
DPU
Bit
AO
-
6
-
Disable weak Pull-up
Reserved
The value read from this bit is indeterminate. Do not change these bits.
XRAM Size
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 when a MOVX or MOVC instruction is used.
0
1
0
1
5
-
4
-
weak pull-up is enabled
weak pull-up is disabled
256 bytes (default)
512 bytes
3
XRS0
2
EXTRAM
1
4202F–SCR–07/2008
AO
0