TS80C51RA2-VCB Atmel, TS80C51RA2-VCB Datasheet - Page 15

• Manufacturer Part Number: TS80C51RA2-VCB
• Description: IC MCU 8BIT 256BYTE 40MHZ 44PLCC
• Manufacturer: Atmel
• Series: 80Cr

Specifications of TS80C51RA2-VCB

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40/30MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 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: -
• Program Memory Size: -
• Data Converters: -

ASSEMBLY LANGUAGE
; Block move using dual data pointers
; Destroys DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
;
0000 909000
0003 05A2
0005 90A000
0008
0008 05A2
000A E0
000B A3
000C 05A2
000E F0
000F A3
0010 70F6
0012 05A2
INC is a short (2 bytes) and fast (12 clocks) way to manipulate the DPS bit in the AUXR1 SFR. However,
note that the INC instruction does not directly force the DPS bit to a particular state, but simply toggles it.
In simple routines, such as the block move example, only the fact that DPS is toggled in the proper sequence
matters, not its actual value. In other words, the block move routine works the same whether DPS is '0' or '1'
on entry. Observe that without the last instruction (INC AUXR1), the routine will exit with DPS in the
opposite state.
Rev. C - 06 March, 2001
MOV DPTR,#SOURCE
INC AUXR1
MOV DPTR,#DEST
LOOP:
INC AUXR1
MOVX A,@DPTR
INC DPTR
INC AUXR1
MOVX @DPTR,A
INC DPTR
JNZ LOOP
INC AUXR1
AUXR1 EQU 0A2H
; address of SOURCE
; switch data pointers
; address of DEST
; switch data pointers
; get a byte from SOURCE
; increment SOURCE address
; switch data pointers
; write the byte to DEST
; increment DEST address
; check for 0 terminator
; (optional) restore DPS
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
TS80C51RA2/RD2
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