AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

For details about these two section, see “NRWW – No Read-While-Write Section” on page 267

and “RWW – Read-While-Write Section” on page 267

Table 24-8. Explanation of Different Variables used in Figure 24-3 and the Mapping to the Z-

pointer

Variable

Corresponding

Z-value(1)

Description

PCMSB

11

Most significant bit in the Program Counter. (The

Program Counter is 12 bits PC[11:0])

PAGEMSB

4

Most significant bit which is used to address the

words within one page (32 words in a page requires

5 bits PC [4:0]).

ZPCMSB

Z12

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 PAGEMSB.

Z5

Because Z0 is not used, the ZPAGEMSB equals

PAGEMSB + 1.

PCPAGE

PC[11:5]

Z12:Z6

Program counter page address: Page select, for

page erase and page write

PCWORD

PC[4:0]

Z5:Z1

Program counter word address: Word select, for

filling temporary buffer (must be zero during page

write operation)

Note:

1. Z15:Z13: always ignored

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

See “Addressing the Flash During Self-Programming” on page 272 for details about the use of

Z-pointer during Self-Programming.

4317K–AVR–03/2013

279

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