attiny167-esxz ATMEL Corporation, attiny167-esxz Datasheet - Page 107

• Manufacturer Part Number: attiny167-esxz
• Description: 8-bit Avr 8-bit Microcontroller Microcontroller With 16k Bytes In-system Programmable Flash And Lin Controller
• Manufacturer: ATMEL Corporation

12.3.1
7728A–AUTO–07/08
Code Examples
The following code examples show how to access the 16-bit timer registers assuming that no
interrupts updates the temporary register. The same principle can be used directly for accessing
the OCR1A/B and ICR1 Registers. Note that when using “C”, the compiler handles the 16-bit
access.
Note:
The assembly code example returns the TCNT1 value in the r17:r16 register pair.
It is important to notice that accessing 16-bit registers are atomic operations. If an interrupt
occurs between the two instructions accessing the 16-bit register, and the interrupt code
updates the temporary register by accessing the same or any other of the 16-bit timer registers,
then the result of the access outside the interrupt will be corrupted. Therefore, when both the
main code and the interrupt code update the temporary register, the main code must disable the
interrupts during the 16-bit access.
Assembly Code Examples
C Code Examples
...
; Set TCNT
ldi
ldi
sts
sts
; Read TCNT
lds
lds
...
unsigned int i;
...
/* Set TCNT
TCNT
/* Read TCNT
i = TCNT
...
1. The example code assumes that the part specific header file is included.
1
= 0x1FF;
r17,0x01
r16,0xFF
TCNT
TCNT
r16,TCNT
r17,TCNT
1
;
1
(1)
1
1
1
1
H,r17
L,r16
1
to 0x01FF
into r17:r16
to 0x01FF */
into i */
1
1
L
H
(1)
ATtiny167
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