ATMEGA324A-PU Atmel, ATMEGA324A-PU Datasheet - Page 15

• Manufacturer Part Number: ATMEGA324A-PU
• Description: IC MCU AVR 32K 20MHZ 40PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA324A-PU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: Atmega
• No. Of I/o's: 32
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 20MHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.5.1
6.6
8272A–AVR–01/10
Instruction Execution Timing
SPH and SPL – Stack Pointer High and Stack pointer Low
Note:
Table 6-2.
This section describes the general access timing concepts for instruction execution. The AVR
CPU is driven by the CPU clock clk
chip. No internal clock division is used.
Figure 6-4 on page 15
by the Harvard architecture and the fast-access Register File concept. This is the basic pipelin-
ing concept to obtain up to 1 MIPS per MHz with the corresponding unique results for functions
per cost, functions per clocks, and functions per power-unit.
Figure 6-4.
Figure 6-5
operation using two register operands is executed, and the result is stored back to the destina-
tion register.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Bit
0x3E (0x5E)
0x3D (0x5D)
Read/Write
Initial Value
2nd Instruction Execute
3rd Instruction Execute
1st Instruction Execute
2nd Instruction Fetch
1. Initial values respectively for the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
3rd Instruction Fetch
4th Instruction Fetch
1st Instruction Fetch
ATmega164A/ATmega164PA
ATmega324A/ATmega324PA
ATmega644A/ATmega644PA
shows the internal timing concept for the Register File. In a single clock cycle an ALU
ATmega1284/ATmega1284P
Stack Pointer size
The Parallel Instruction Fetches and Instruction Executions
R/W
SP7
15
R
–
7
0
1
clk
Device
CPU
shows the parallel instruction fetches and instruction executions enabled
SP6
R/W
14
R
–
6
0
1
SP5
R/W
CPU
13
R
–
5
0
1
T1
, directly generated from the selected clock source for the
SP12
0/0
SP4
R/W
R/W
12
4
1
(1)
T2
SP11
0/1
SP3
R/W
R/W
11
3
1
(1)
SP10
1/0
SP2
R/W
R/W
10
Stack Pointer size
2
1
(1)
SP[10:0]
SP[11:0]
SP[12:0]
SP[13:0]
T3
SP9
SP1
R/W
R/W
9
1
0
1
SP8
SP0
R/W
R/W
8
0
0
1
T4
SPH
SPL
15