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ATMEGA640 Datasheet(PDF) 15 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 15 Page - ATMEL Corporation

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ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
RAMPZ – Extended Z-pointer
Register for ELPM/SPM
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as
shown in Figure 8. Note that LPM is not affected by the RAMPZ setting.
Figure 8. The Z-pointer used by ELPM and SPM
The actual number of bits is implementation dependent. Unused bits in an implementa-
tion will always read as zero. For compatibility with future devices, be sure to write these
bits to zero.
EIND – Extended Indirect
Register
For EICALL/EIJMP instructions, the Indirect-pointer to the subroutine/routine is a con-
catenation of EIND, ZH, and ZL, as shown in Figure 9. Note that ICALL and IJMP are
not affected by the EIND setting.
Figure 9. The Indirect-pointer used by EICALL and EIJMP
The actual number of bits is implementation dependent. Unused bits in an implementa-
tion will always read as zero. For compatibility with future devices, be sure to write these
bits to zero.
Bit
7654
32
1
0
0x3B (0x5B)
RAMPZ7
RAMPZ6
RAMPZ5
RAMPZ4
RAMPZ3
RAMPZ2
RAMPZ1
RAMPZ0
RAMPZ
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0000
00
0
0
Bit (
Individually)
70
7
0
7
0
RAMPZ
ZH
ZL
Bit (Z-pointer)
23
16
15
8
7
0
Bit
7654
32
1
0
0x3C (0x5C)
EIND7
EIND6
EIND5
EIND4
EIND3
EIND2
EIND1
EIND0
EIND
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0000
00
0
0
Bit (Individual-
ly)
70
7
0
7
0
EIND
ZH
ZL
Bit
(Indirect-
pointer)
23
16
15
8
7
0



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