ATtiny167 Automotive Atmel Corporation, ATtiny167 Automotive Datasheet - Page 56

• Manufacturer Part Number: ATtiny167 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny167 Automotive

• Flash (kbytes): 16 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

6.3.2
56
ATtiny87/ATtiny167
Clock monitoring
The following code example shows one assembly and one C function for changing the
time-out value of the Watchdog Timer.
Notes:
The Watchdog Timer can be used to detect a loss of system clock. This configuration is driven
by the dynamic clock switch circuit. Please refer to
34
Assembly Code Example
C Code Example
for more information.
WDT_Prescaler_Change:
void WDT_Prescaler_Change(void)
{
}
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Start timed sequence
lds r16, WDTCR
ori
sts WDTCR, r16
; -- Got four cycles to set the new values from here -
; Set new prescaler(time-out) value = 64K cycles (~0.5 s)
ldi
sts WDTCR, r16
; -- Finished setting new values, used 2 cycles -
; Turn on global interrupt
sei
ret
__disable_interrupt();
__watchdog_reset();
/* Start timed sequence */
WDTCR |= (1<<WDCE) | (1<<WDE);
/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
WDTCR
__enable_interrupt();
1.
2. The Watchdog Timer should be reset before any change of the WDP bits, since a change in
See ”About Code Examples” on page 6.
the WDP bits can result in a time-out when switching to a shorter time-out period.
r16, (1<<WDCE) | (1<<WDE)
r16, (1<<WDE) | (1<<WDP2) | (1<<WDP0)
= (1<<WDE) | (1<<WDP2) | (1<<WDP0);
(1)
(1)
Section 4.3.8 “Clock Monitoring” on page
7728G–AVR–06/10