ATMEGA8515L8AU

Manufacturer Part NumberATMEGA8515L8AU
DescriptionTQFP44
ManufacturerATMEL Corporation
ATMEGA8515L8AU datasheet
 

Specifications of ATMEGA8515L8AU

Date_code10+  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Page 41
42
Page 42
43
Page 43
44
Page 44
45
Page 45
46
Page 46
47
Page 47
48
Page 48
49
Page 49
50
Page 50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
Page 43/257

Download datasheet (3Mb)Embed
PrevNext
Standby Mode
Minimizing Power
Consumption
Analog Comparator
Brown-out Detector
Internal Voltage Reference
Watchdog Timer
2512J–AVR–10/06
When the SM2..0 bits are written to 110, and an external crystal/resonator clock option
is selected, the SLEEP instruction makes the MCU enter Standby mode. This mode is
identical to Power-down with the exception that the Oscillator is kept running. From
Standby mode, the device wakes up in six clock cycles.
Table 17. Active Clock Domains and Wake-up Sources in the Different Sleep Modes
Active Clock domains
Sleep Mode
clk
clk
CPU
FLASH
Idle
Power-down
(1)
Standby
Notes:
1. External Crystal or resonator selected as clock source
2. Only INT2 or level interrupt INT1 and INT0
There are several issues to consider when trying to minimize the power consumption in
an AVR controlled system. In general, sleep modes should be used as much as possi-
ble, and the sleep mode should be selected so that as few as possible of the device’s
functions are operating. All functions not needed should be disabled. In particular, the
following modules may need special consideration when trying to achieve the lowest
possible power consumption.
When entering Idle mode, the Analog Comparator should be disabled if not needed. In
the other sleep modes, the Analog Comparator is automatically disabled. However, if
the Analog Comparator is set up to use the Internal Voltage Reference as input, the
Analog Comparator should be disabled in all sleep modes. Otherwise, the Internal Volt-
age Reference will be enabled, independent of sleep mode. Refer to “Analog
Comparator” on page 164 for details on how to configure the Analog Comparator.
If the Brown-out Detector is not needed in the application, this module should be turned
off. If the Brown-out Detector is enabled by the BODEN Fuse, it will be enabled in all
sleep modes, and hence, always consume power. In the deeper sleep modes, this will
contribute significantly to the total current consumption. Refer to “Brown-out Detection”
on page 48 for details on how to configure the Brown-out Detector.
The Internal Voltage Reference will be enabled when needed by the Brown-out Detector
or the Analog Comparator. If these modules are disabled as described in the sections
above, the internal voltage reference will be disabled and it will not be consuming
power. When turned on again, the user must allow the reference to start up before the
output is used. If the reference is kept on in sleep mode, the output can be used imme-
diately. Refer to “Internal Voltage Reference” on page 50 for details on the start-up time.
If the Watchdog Timer is not needed in the application, this module should be turned off.
If the Watchdog Timer is enabled, it will be enabled in all sleep modes, and hence,
always consume power. In the deeper sleep modes, this will contribute significantly to
the total current consumption. Refer to page 53 for details on how to configure the
Watchdog Timer.
ATmega8515(L)
Oscillators
Wake-up Sources
INT2
Main Clock
INT1
EEPROM
clk
Source Enabled
INT0
IO
X
X
X
(2)
X
(2)
X
X
SPM/
Ready
Other I/O
X
X
43