AT89C51RE2-RLTUM Atmel, AT89C51RE2-RLTUM Datasheet - Page 19

• Manufacturer Part Number: AT89C51RE2-RLTUM
• Description: MCU 8051 128K FLASH 44-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RE2-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89OCD-01
• Minimum Operating Temperature: - 40 C
• Height: 1.45 mm
• Length: 10.1 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 10.1 mm
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

7663E–8051–10/08
Table 17. AUXR1 register
AUXR1- Auxiliary Register 1(0A2h)
Reset Value: XX0X XX0X0b
Not bit addressable
Note:
ASSEMBLY LANGUAGE
Number
; Block move using dual data pointers
; Modifies DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
;
0000 909000MOV DPTR,#SOURCE ; address of SOURCE
0003 05A2 INC AUXR1 ; switch data pointers
0005 90A000 MOV DPTR,#DEST ; address of DEST
0008
0008 05A2 INC AUXR1 ; switch data pointers
000A E0 MOVX A,@DPTR ; get a byte from SOURCE
000B A3 INC DPTR ; increment SOURCE address
000C 05A2 INC AUXR1 ; switch data pointers
000E F0 MOVX @DPTR,A ; write the byte to DEST
000F A3 INC DPTR ; increment DEST address
EES
Bit
7
7
6
5
4
3
2
1
0
*Bit 2 stuck at 0; this allows to use INC AUXR1 to toggle DPS without changing GF3.
LOOP:
AUXR1 EQU 0A2H
Mnemonic
DPS
SP9
EES
SP9
GF2
Bit
U2
6
0
-
-
Description
Enable Extended Stack
Set to enable the extended stack
Clear to disable the extended stack (default value)
Stack Pointer 9th Bit
This bit has no effect when the EES bit is cleared.
Set when the stack pointer belongs to the XRAM memory space
Cleared when the stack pointer belongs to the 256bytes of internal RAM.
P4 bit addressable
Clear to map SCON_1 register at C0h sfr address
Set to map P4 port register at C0h address.
Reserved
Reserved
Data Pointer Selection
U2
5
This bit allows the selection of the stack extended mode.
The value read from this bit is indeterminate. Do not set this bit.
This bit is a general purpose user flag. *
Always cleared.
The value read from this bit is indeterminate. Do not set this bit.
Cleared to select DPTR0.
Set to select DPTR1.
4
-
GF2
3
2
0
AT89C51RE2
1
-
DPS
0
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