ATTINY40-MMHR Atmel, ATTINY40-MMHR Datasheet - Page 93
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ATTINY40-MMHR
Manufacturer Part Number
ATTINY40-MMHR
Description
MCU AVR 4KB FLASH 12MHZ 3X3 QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY40-MMHR.pdf
(216 pages)
Specifications of ATTINY40-MMHR
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
18
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Manufacturer
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12.9.1
8263A–AVR–08/10
Reusing the temporary high byte register
The following code examples show how to do an atomic write of the TCNT1H/L register con-
tents. Writing any of the OCR1A/B registers can be done by using the same principle.
Note:
The assembly code example requires that the r17:r16 register pair contains the value to be writ-
ten to TCNT1H/L.
If writing to more than one 16-bit register where the high byte is the same for all registers written,
then the high byte only needs to be written once. However, note that the same rule of atomic
operation described previously also applies in this case.
Assembly Code Example
TIM1_WriteTCNT1:
C Code Example
void TIM1_WriteTCNT1( unsigned int i )
{
}
; Save global interrupt flag
in r18,SREG
; Disable interrupts
cli
; Set TCNT
out TCNT1H,r17
out TCNT1L,r16
; Restore global interrupt flag
out SREG,r18
ret
unsigned char sreg;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
_CLI();
/* Set TCNT1 to i */
TCNT1H = (i >> 8);
TCNT1L = (unsigned char)i;
/* Restore global interrupt flag */
SREG = sreg;
See
“Code Examples” on page
1
to r17:r16
6.
93
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