335
7679H–CAN–08/08
AT90CAN32/64/128
Notes: 1. See “Addressing the Flash During Self-Programming” on page 327 for details about the use of
Z-pointer during self-programming.
2. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
3. The Z-register is only 16 bits wide. Bit 16 is located in RAMPZ register in I/O map.
Table 24-8. Explanation of Different Variables Used in Figure 24-3 on page 328 and the Mapping to the Z-Pointer
(1)
Device
Variable
Name
Variable
Value
Corresponding
Z-value
Description
(2)
AT90CAN32
PCMSB 13 Most significant bit in the program counter. (The program counter is 14 bits PC[13:0])
PAGEMSB 6
Most significant bit which is used to address the words within one page (128 words in a page
requires 7 bits PC [6:0]).
ZPCMSB Z14
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals
PCMSB + 1.
ZPAGEMSB Z7
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1.
PCPAGE PC[13:7] Z14:Z7 Program counter page address: Page select, for Page Erase and Page Write.
PCWORD PC[6:0] Z7:Z1
Program counter word address: Word select, for filling temporary buffer (must be zero during
PAGE WRITE operation).
AT90CAN64
PCMSB 14 Most significant bit in the program counter. (The program counter is 15 bits PC[14:0])
PAGEMSB 6
Most significant bit which is used to address the words within one page (128 words in a page
requires 7 bits PC [6:0]).
ZPCMSB Z15
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals
PCMSB + 1.
ZPAGEMSB Z7
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1.
PCPAGE PC[14:7] Z15:Z7 Program counter page address: Page select, for Page Erase and Page Write.
PCWORD PC[6:0] Z7:Z1
Program counter word address: Word select, for filling temporary buffer (must be zero during
PAGE WRITE operation).
AT90CAN128
PCMSB 15 Most significant bit in the program counter. (The program counter is 16 bits PC[15:0])
PAGEMSB 6
Most significant bit which is used to address the words within one page (128 words in a page
requires 7 bits PC [6:0]).
ZPCMSB Z16
(3)
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals
PCMSB + 1.
ZPAGEMSB Z7
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1.
PCPAGE PC[15:7] Z16
(3)
:Z7 Program counter page address: Page select, for Page Erase and Page Write.
PCWORD PC[6:0] Z7:Z1
Program counter word address: Word select, for filling temporary buffer (must be zero during
PAGE WRITE operation).
To Next Page
Loading...
Need help?
General
