MC68HC708AS48

Manufacturer Part NumberMC68HC708AS48
DescriptionAdvance Information
ManufacturerFREESCALE [Freescale Semiconductor, Inc]
MC68HC708AS48 datasheet
 
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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
Page 71
72
Page 72
73
Page 73
74
Page 74
75
Page 75
76
Page 76
77
Page 77
78
Page 78
79
Page 79
80
Page 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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
Page 71/396

Download datasheet (4Mb)Embed
PrevNext
In general, all bits should be erased before being programmed.
However, if program/erase cycling is of concern, the following procedure
can be used to minimize bit cycling in each EEPROM byte. If any bit in
a byte must be changed from a 0 to a 1, the byte needs to be erased
before programming.
before programming.
EEPROM Data To Be
MC68HC708AS48
Rev. 4.0
MOTOROLA
Electrically Erasable Programmable ROM (EEPROM)
Electrically Erasable Programmable ROM (EEPROM)
erase. Any attempts to read other EEPROM data will read the
latched data. If EELAT is set, other writes to the EECR will be
allowed after a valid EEPROM write.
b. To ensure proper erasing sequence, the EEPGM bit cannot
be set if the EELAT bit is cleared and a non-EEPROM write
has occurred. Once EEPGM is set, the type of erase mode
cannot be modified. If EEPGM is set, the on-board charge
pump generates the erase voltage and applies it to the user
EEPROM array. When the EEPGM bit is cleared, the erase
voltage is removed from the array and the internal charge
pump is turned off.
c. Any attempt to clear both EEPGM and EELAT bits with a
single instruction will clear only EEPGM to allow time for
removal of high voltage from the EEPROM array.
Table 6-1
summarizes the conditions for erasing
Table 6-1. EEPROM Program/Erase Cycling Reduction
EEPROM Data Before
Programmed
Programming
0
0
1
1
Functional Description
Erase Before
Programming?
0
No
1
No
0
Yes
1
No
Advance Information
71