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ATmega328P Datasheet(PDF) 255 Page - ATMEL Corporation

Part # ATmega328P
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  345 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega328P Datasheet(HTML) 255 Page - ATMEL Corporation

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7810A–AVR–11/09
ATmega328P [Preliminary]
Where:.
a.
ADCH & ADCL are the ADC data registers,
b.
is the temperature sensor gain
c.
TS_OFFSET is the temperature sensor offset correction term
TS_GAIN is the unsigned fixed point 8-bit temperature sensor gain factor in
1/128th units stored in the signature row.
TS_OFFSET is the signed twos complement temperature sensor offset reading
stored in the signature row. See Table 26-5 on page 280 for signature row
parameter address
The following code example allows to read Signature Row data
.equ TS_GAIN = 0x0003
.equ TS_OFFSET = 0x0002
LDI R30,LOW(TS_GAIN)
LDI R31,HIGH (TS_GAIN)
RCALL Read_signature_row
MOV R17,R16 ; Save R16 result
LDI R30,LOW(TS_OFFSET)
LDI R31,HIGH (TS_OFFSET)
RCALL Read_signature_row
; R16 holds TS_OFFSET and R17 holds TS_GAIN
Read_signature_row:
IN R16,SPMCSR ; Wait for SPMEN ready
SBRC R16,SPMEN ; Exit loop here when SPMCSR is free
RJMP Read_signature_row
LDI R16,((1<<SIGRD)|(1<<SPMEN)) ; We need to set SIGRD and SPMEN together
OUT SPMCSR,R16 ; and execute the LPM within 3 cycles
LPM R16,Z
RET



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