ATtiny167-ESSZ datasheet(204/282 Pages) ATMEL

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204

7728D–AVR–07/09

ATtiny87/ATtiny167

The following code example allows to read Signature Row data:

.equ TS_GAIN = 0x0007

.equ TS_OFFSET = 0x0005

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

17.10 Internal Voltage Reference Output

The internal voltage reference is output on XREF pin as described in Table 17-3 if the ADC is

turned on (See “Voltage Reference Enable Signals and Start-up Time” on page 53.). Addition

of an external filter capacitor (5 - 10 nF) on XREF pin may be necessary. XREF current load

must be from 1 µA to 100 µA with VCC from 2.7V to 5.5V for XREF = 1.1V and with VCC from

4.5V to 5.5V for XREF = 2.56V.

XREF pin can be coupled to an analog input of the ADC (See ”Pin Configuration” on page 5.).

Notes:

1. See ”Bit 1 – XREFEN: Internal Voltage Reference Output Enable” on page 210.

2. See ”Bit 7:6 – REFS1:REFS0: Voltage Reference Selection Bits” on page 205.

3. In these configurations, the pin pull-up must be turned off and the pin digital output must be

set in Hi-Z.

4. Vcc in range 4.5 - 5.5V.

Table 17-3.

Internal Voltage Reference Output

XREFEN (1)

REFS1 (2)

REFS0 (2)

Voltage Reference Output (Iload ≤ 100 µA)

Hi-Z, the pin can be used as AREF input or other alternate

functions.

1 (1)

XREF = 1.1V (3)

1 (1)

XREF = 2.56V (3)(4)

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