atmega323l ATMEL Corporation, atmega323l Datasheet - Page 18

• Manufacturer Part Number: atmega323l
• Description: Atmega323 8-bit Avr Microcontroller With 32k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

I/O Memory
18
ATmega323(L)
Figure 22. Single Cycle ALU Operation
The internal data SRAM access is performed in two System Clock cycles as described
in Figure 23.
Figure 23. On-chip Data SRAM Access Cycles
The I/O space definition of the ATmega323 is shown in Table 2.
Table 2. ATmega323 I/O Space
Register Operands Fetch
I/O Address (SRAM
Address)
$3F ($5F)
$3E ($5E)
$3D ($5D)
$3C ($3C)
$3B ($5B)
$3A ($5A)
$39 ($59)
$38 ($58)
$37 ($57)
$36 ($56)
$35 ($55)
$34 ($54)
ALU Operation Execute
System Clock Ø
Total Execution Time
Result Write Back
System Clock Ø
Address
Data
Data
WR
RD
Name
SREG
SPH
SPL
OCR0
GICR
GIFR
TIMSK
TIFR
SPMCR
TWCR
MCUCR
MCUCSR
Prev. Address
T1
T1
Status Register
Stack Pointer High
Stack Pointer Low
Timer/Counter0 Output Compare Register
Timer/Counter Interrupt Mask Register
Timer/Counter Interrupt Flag Register
SPM Control Register
Two-wire Serial Interface Control Register
MCU general Control Register
MCU general Control and Status Register
Function
General Interrupt Control Register
General Interrupt Flag Register
Address
T2
T2
T3
T3
1457G–AVR–09/03
T4
T4