ATmega32HVB datasheet(205/273 Pages) ATMEL

205 / 273 page

205

8042A–AVR–07/09

ATmega16HVB/32HVB

Note:

1. Z0: should be zero for all SPM commands, byte select for the LPM instruction.

See ”Addressing the Flash During Self-Programming” on page 196 for details about the use of

Z-pointer during Self-Programming.

29.8.14

ATmega32HVB Boot Loader Parameters

In Table 29-8 through Table 29-10, the parameters used in the description of the Self-Program-

ming are given

Note:

1. The different BOOTSZ Fuse configurations are shown in Figure 29-2

For details about these two section, see ”NRWW – No Read-While-Write Section” on page 192 and ”RWW

– Read-While-Write Section” on page 192

Table 29-8.

Boot Size Configuration

(1)

256 words

0x0000 - 0x3EFF

0x3F00 - 0x3FFF

0x3EFF

0x3F00

512 words

0x0000 - 0x3DFF

0x3E00 - 0x3FFF

0x3DFF

0x3E00

1024 words

0x0000 - 0x3BFF

0x3C00 - 0x3FFF

0x3BFF

0x3C00

2048 words

0x0000 - 0x37FF

0x3800 - 0x3FFF

0x37FF

0x3800

Table 29-9.

Read-While-Write Limit

(1)

Section

Pages

Address

Read-While-Write section (RWW)

224

0x0000 - 0x37FF

No Read-While-Write section (NRWW)

0x3800 - 0x3FFF

Table 29-10. Explanation of different variables used in Figure 29-3 on page 196 and the map-

ping to the Z-pointer(1)

Variable

Corresponding

Z-value

Description

PCMSB

Most significant bit in the Program Counter. (The

Program Counter is 14 bits PC[13:0])

PAGEMSB

Most significant bit which is used to address the

words within one page (64 words in a page requires

six bits PC [5:0]).

ZPCMSB

Z14

Bit in Z-register that is mapped to PCMSB. Because

Z0 is not used, the ZPCMSB equals PCMSB + 1.

ZPAGEMSB

Bit in Z-register that is mapped to PCMSB. Because

Z0 is not used, the ZPAGEMSB equals PAGEMSB +

PCPAGE

PC[13:6]

Z13:Z7

Program Counter page address: Page select, for

Page Erase and Page Write

PCWORD

PC[5:0]

Z6:Z1

Program Counter word address: Word select, for

filling temporary buffer (must be zero during Page

Write operation)

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