ATTINY20-MMH Atmel, ATTINY20-MMH Datasheet - Page 10
![MCU AVR 2KB FLASH 12MHZ 20QFN](/photos/30/99/309958/qfn-16_sml.jpg)
ATTINY20-MMH
Manufacturer Part Number
ATTINY20-MMH
Description
MCU AVR 2KB FLASH 12MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY20-EK1.pdf
(224 pages)
Specifications of ATTINY20-MMH
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
12
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Ram Size
128 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
*
Processor Series
ATtiny
Core
AVR
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
SPI, TWI
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY20-MMHR
Manufacturer:
ATMEL
Quantity:
20 000
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4.5
4.6
10
Stack Pointer
Instruction Execution Timing
ATtiny20
Figure 4-3.
In different addressing modes these address registers function as automatic increment and
automatic decrement (see document “AVR Instruction Set” and section
mary” on page 210
The stack is mainly used for storing temporary data, local variables and return addresses after
interrupts and subroutine calls. The Stack Pointer registers (SPH and SPL) always point to the
top of the stack. Note that the stack grows from higher memory locations to lower memory loca-
tions. This means that the PUSH instructions decreases and the POP instruction increases the
stack pointer value.
The stack pointer points to the area of data memory where subroutine and interrupt stacks are
located. This stack space must be defined by the program before any subroutine calls are exe-
cuted or interrupts are enabled.
The pointer is decremented by one when data is put on the stack with the PUSH instruction, and
incremented by one when data is fetched with the POP instruction. It is decremented by two
when the return address is put on the stack by a subroutine call or a jump to an interrupt service
routine, and incremented by two when data is fetched by a return from subroutine (the RET
instruction) or a return from interrupt service routine (the RETI instruction).
The AVR stack pointer is typically implemented as two 8-bit registers in the I/O register file. The
width of the stack pointer and the number of bits implemented is device dependent. In some
AVR devices all data memory can be addressed using SPL, only. In this case, the SPH register
is not implemented.
The stack pointer must be set to point above the I/O register areas, the minimum value being the
lowest address of SRAM. See
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.
X-register
Y-register
Z-register
The X-, Y-, and Z-registers
for details).
15
7
15
7
15
7
Figure 5-1 on page
CPU
R27
R29
R31
XH
YH
ZH
, directly generated from the selected clock source for the
16.
0
0
0
7
7
7
“Instruction Set Sum-
XL
YL
ZL
R26
R28
R30
8235B–AVR–04/11
0
0
0
0
0
0
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