ATmega3290P datasheet(290/385 Pages) ATMEL

290 / 385 page

290

8021E–AVR–07/09

ATmega329P/3290P

Note:

1. For details about these two section, see ”NRWW – No Read-While-Write Section” on page 279 and ”RWW – Read-While-

Write Section” on page 279.

Note:

1. Z0: should be zero for all SPM commands, byte select for the LPM instruction. See ”Addressing the Flash During Self-Pro-

gramming” on page 283 for details about the use of Z-pointer during Self-Programming.

25.9

25.9.1

SPMCSR – Store Program Memory Control and Status Register

The Store Program Memory Control and Status Register contains the control bits needed to con-

trol the Boot Loader operations.

• Bit 7 – SPMIE: SPM Interrupt Enable

When the SPMIE bit is written to one, and the I-bit in the Status Register is set (one), the SPM

ready interrupt will be enabled. The SPM ready Interrupt will be executed as long as the SPMEN

bit in the SPMCSR Register is cleared.

• Bit 6 – RWWSB: Read-While-Write Section Busy

When a Self-Programming (Page Erase or Page Write) operation to the RWW section is initi-

ated, the RWWSB will be set (one) by hardware. When the RWWSB bit is set, the RWW section

cannot be accessed. The RWWSB bit will be cleared if the RWWSRE bit is written to one after a

Table 25-7.

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 25-8.

Explanation of different variables used in Figure 25-3 and the mapping to the Z-pointer(1)

Variable

Corresponding

Z-value

Description

PCMSB

Most significant bit in the Program Counter. (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/seven 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 + 1.

PCPAGE

PC[13:6]

Z14: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)

Bit

0x37 (0x57)

SPMIE

RWWSB

–

RWWSRE

BLBSET

PGWRT

PGERS

SPMEN

SPMCSR

Read/Write

R/W

Initial Value

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