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參數(shù)資料
| 型號(hào)： | M306V5EESP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDIP64 |
| 封裝： | 0.750 INCH, PLASTIC, SDIP-64 |
| 文件頁(yè)數(shù)： | 19/152頁(yè) |
| 文件大?。?/td> | 1963K |
| 代理商： | M306V5EESP |
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142
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
19.3
Performing a Page Write
To execute 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 is ignored. The page address must be written to
PCPAGE. Other bits in the Z-pointer must be written to zero during this operation.
Note:
The CPU is halted during the Page Write operation.
19.4
Addressing the Flash During Self-Programming
The Z-pointer is used to address the SPM commands.
Since the Flash is organized in pages (see Table 20-8 on page 150), the Program Counter can be treated as hav-
ing 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 Figure 19-1. Note that the Page
Erase and Page Write operations are addressed independently. Therefore it is of major importance that the soft-
ware addresses the same page in both the Page Erase and Page Write operation.
The LPM instruction uses the Z-pointer to store the address. Since this instruction addresses the Flash byte-by-
byte, also the LSB (bit Z0) of the Z-pointer is used.
Figure 19-1. Addressing the Flash During SPM(1)
Note:
1. The different variables used in Figure 19-1 are listed in Table 20-8 on page 150.
19.5
EEPROM Write Prevents Writing to SPMCSR
Note that an EEPROM write operation will block all software programming to Flash. Reading the Fuses and Lock
bits from software will also be prevented during the EEPROM write operation. It is recommended that the user
checks the status bit (EEPE) in the EECR Register and verifies that the bit is cleared before writing to the SPMCSR
Register.
Bit
1514
1312
1110
9
8
ZH (R31)
Z15
Z14
Z13
Z12
Z11
Z10
Z9
Z8
ZL (R30)
Z7Z6
Z5Z4Z3
Z2Z1
Z0
765
43
21
0
PROGRAM MEMORY
0
1
15
Z - REGISTER
BIT
0
ZPAGEMSB
WORD ADDRESS
WITHIN A PAGE
PAGE ADDRESS
WITHIN THE FLASH
ZPCMSB
INSTRUCTION WORD
PAGE
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
PAGE
PCWORD
PCPAGE
PCMSB
PAGEMSB
PROGRAM
COUNTER
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| M306V5EESS | 功能描述:EPROM MCU/M16C(TV/VTR) RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:適配器板 適用于相關(guān)產(chǎn)品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE |
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