ATmega16U4 datasheet(347/408 Pages) ATMEL

Part #	ATmega16U4

Description	8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller

PDF	408 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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347 / 408 page

347

7766D–AVR–01/09

ATmega16U4/ATmega32U4

Note:

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

Note:

See “Addressing the Flash During Self-Programming” on page 339 for details about the use of Z-

pointer during Self-Programming.

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-pointer that is mapped to PCMSB. Because

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

ZPAGEMSB

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

Z0 is not used, the ZPAGEMSB equals PAGEMSB +

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)

Table 27-10. Explanation of different variables used in Figure 27-4 and the mapping to the Z-

pointer

Variable

Corresponding

Z-value(1)

Description

ATmega16U4 Datasheet(PDF) 347 Page - ATMEL Corporation