atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 364

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

28.7.14
364
ATmega32U4
ATmega32U4 Boot Loader Parameters
In
ming are given.
Table 28-8.
Note:
Table 28-9.
Note:
Table 28-10. Explanation of different variables used in
Note:
Note:
Device
AT90USB324
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 28-8
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in
1. For details about these two section, see
1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
See
pointer during Self-Programming.
1
0
1
0
351
“Addressing the Flash During Self-Programming” on page 357
256 words
512 words
1024 words
2048 words
through
Boot Size Configuration (Word Addresses)
Read-While-Write Limit (Word Addresses)
pointer
and
PC[13:6]
PC[5:0]
“RWW – Read-While-Write Section” on page
13
6
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Table
4
8
16
32
28-10, the parameters used in the description of the Self-Program-
Corresponding
Z-value
0x0000 - 0x3EFF
0x0000 - 0x3DFF
0x0000 - 0x3BFF
0x0000 - 0x37FF
Z14:Z7
Z6:Z1
Z14
Z7
(1)
Description
Most significant bit in the Program Counter. (The
Program Counter is 14 bits PC[13:0])
Most significant bit which is used to address the
words within one page (64 words in a page requires
six bits PC [5:0]).
Bit in Z-pointer that is mapped to PCMSB. Because
Z0 is not used, the ZPCMSB equals PCMSB + 1.
Bit in Z-pointer that is mapped to PCMSB. Because
Z0 is not used, the ZPAGEMSB equals PAGEMSB +
1.
Program Counter page address: Page select, for
Page Erase and Page Write
Program Counter word address: Word select, for
filling temporary buffer (must be zero during Page
Write operation)
“NRWW – No Read-While-Write Section” on page
0x3F00 - 0x3FFF
0x3E00 - 0x3FFF
0x3C00 - 0x3FFF
0x3800 - 0x3FFF
Figure 28-4
(1)
(1)
351.
Figure 28-2
Pages
224
32
and the mapping to the Z-
for details about the use of Z-
0x3EFF
0x3DFF
0x3BFF
0x37FF
Address
0x0000 - 0x37FF
0x3800 - 0x3FFF
7766A–AVR–03/08
0x3F00
0x3E00
0x3C00
0x3800