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ATmega1284 Datasheet

8-bit Atmel Microcontroller

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7.5.1 SPH and SPL – Stack Pointer High and Stack pointer Low
Bit
0x3E (0x5E)
0x3D (0x5D)
Read/Write
Initial Value
15
SP7
7
R
R/W
0
1
14
SP6
6
R
R/W
0
1
13
SP5
5
R
R/W
0
1
12
SP12
SP4
4
R/W
R/W
0/0(1)
1
11
SP11
SP3
3
R/W
R/W
0/1(1)
1
10
SP10
SP2
2
R/W
R/W
1/0(1)
1
9
SP9
SP1
1
R/W
R/W
0
1
8
SP8
SP0
0
R/W
R/W
0
1
SPH
SPL
Note: 1. Initial values respectively for the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P.
Table 7-2. Stack Pointer size
Device
ATmega164A/ATmega164PA
ATmega324A/ATmega324PA
ATmega644A/ATmega644PA
ATmega1284/ATmega1284P
Stack Pointer size
SP[10:0]
SP[11:0]
SP[12:0]
SP[13:0]
7.5.2 RAMPZ – Extended Z-pointer Register for ELPM/SPM(1)
Bit
0x3B (0x5B)
Read/Write
Initial Value
7
RAMPZ7
R/W
0
6
RAMPZ6
R/W
0
5
RAMPZ5
R/W
0
4
RAMPZ4
R/W
0
3
RAMPZ3
R/W
0
2
RAMPZ2
R/W
0
1
RAMPZ1
R/W
0
0
RAMPZ0
R/W
0
RAMPZ
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL, as shown in Figure 7-4 on
page 15. Note that LPM is not affected by the RAMPZ setting.
Figure 7-4. The Z-pointer used by ELPM and SPM.
Bit (Individually)
Bit (Z-pointer)
70
RAMPZ
23 16
7
ZH
15
0
8
70
ZL
70
The actual number of bits is implementation dependent. Unused bits in an implementation will always read as
zero. For compatibility with future devices, be sure to write these bits to zero.
Note: 1. RAMPZ is only valid for ATmega1284/ATmega1284P.
7.6 Instruction Execution Timing
This section describes the general access timing concepts for instruction execution. The AVR CPU is driven by
the CPU clock clkCPU, directly generated from the selected clock source for the chip. No internal clock division is
used.
Figure 7-5 on page 16 shows the parallel instruction fetches and instruction executions enabled by the Harvard
architecture and the fast-access Register File concept. This is the basic pipelining concept to obtain up to 1
MIPS per MHz with the corresponding unique results for functions per cost, functions per clocks, and functions
per power-unit.
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P [DATASHEET]
Atmel-8272G-AVR-01/2015
15
ATMEL Corporation
ATMEL Corporation


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