參數(shù)資料
型號: MR80C32E-16P883
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44
文件頁數(shù): 175/176頁
文件大?。?/td> 2962K
代理商: MR80C32E-16P883
98
2535J–AVR–08/10
ATtiny13
If the EEPROM is written in the middle of an SPM Page Load operation, all data loaded will be
lost.
16.3 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.
16.4 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 17-5 on page 104), the Program Counter 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 Figure 16-1. Note that the Page Erase and Page Write 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.
Figure 16-1. Addressing the Flash During SPM(1)
Note:
1. The variables used in Figure 16-1 are listed in Table 17-5 on page 104.
Bit
151413121110
9
8
ZH (R31)
Z15
Z14
Z13
Z12
Z11
Z10
Z9
Z8
ZL (R30)
Z7Z6Z5Z4Z3Z2Z1Z0
765
43210
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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