ATTINY24-15SSZ Atmel, ATTINY24-15SSZ Datasheet - Page 158

• Manufacturer Part Number: ATTINY24-15SSZ
• Description: MCU AVR 2K FLASH 15MHZ 14-SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY24-15SSZ

• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 12
• Eeprom Size: 128 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Program Memory Size: 2KB (2K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Cpu Family: ATtiny
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 16MHz
• Interface Type: SPI/UART
• Total Internal Ram Size: 128Byte
• # I/os (max): 12
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20.3
20.4
158
Performing a Page Write
Addressing the Flash During Self-Programming
Atmel ATtiny24/44/84 [Preliminary]
To execute a page write, set up the address in the Z-pointer, write "00000101" to SPMCSR,
and execute SPM within four clock cycles after writing SPMCSR. The data in R1 and R0 are
ignored. The page address must be written to PCPAGE. Other bits in the Z-pointer must be
written to zero during this operation.
The CPU is halted during the page write operation.
The Z-pointer is used to address the SPM commands.
Because the Flash is organized in pages (see
can be treated as having two different sections. One section, consisting of the least significant
bits, is addressing the words within a page, while the most significant bits are addressing the
pages. This is shown in
operations are addressed independently. Therefore it is of major importance that the software
addresses the same page in both the Page Erase and Page Write operation.
The LPM instruction uses the Z-pointer to store the address. Because this instruction
addresses the flash byte-by-byte, the LSB (bit Z0) of the Z-pointer is also used.
Figure 20-1. Addressing the Flash During SPM
Note:
Bit
ZH (R31)
ZL (R30)
Z - REGISTER
1. The different variables used in
PROGRAM MEMORY
BIT
PAGE
PROGRAM
COUNTER
15
Z15
15
Z7
7
PAGE ADDRESS
WITHIN THE FLASH
ZPCMSB
PCMSB
Figure 21-1 on page
Z14
14
Z6
6
PCPAGE
Z13
Z5
13
5
Figure 20-1
ZPAGEMSB
PAGEMSB
PCWORD
Z12
12
Z4
4
166. Note that the Page Erase and Page Write
Table 21-7 on page
WORD ADDRESS
WITHIN A PAGE
(1)
are listed in
1
Z11
0
0
11
Z3
3
INSTRUCTION WORD
PAGE
Table 21-7 on page
Z10
10
Z2
2
165), the Program Counter
Z9
Z1
9
1
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
165.
Z8
Z0
7701D–AVR–09/10
8
0