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| 型号： | ST72621K4B1 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, LEAD FREE, SHRINK, PLASTIC, DIP-32 |
| 文件页数： | 41/139页 |
| 文件大小： | 1264K |
| 代理商： | ST72621K4B1 |
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Doc ID 6996 Rev 5
15 IMPORTANT NOTES
Refer to Table 32 which provides a list of the trace
codes for each of the recent silicon revisions.
Silicon revisions are identifiable:
– on the device package, by the last letter of the
Trace Code marked on the device package.
– on the box, by the last 3 digits of the Internal
Sales Type printed in the box label.
See also Figure 92. on page 137
Table 32. Device Identification
15.1 A/ D CONVERTER ACCURACY FOR FIRST
CONVERSION
Description
When the ADC is enabled after being powered
down (for example when waking up from HALT,
ACTIVE-HALT or setting the ADON bit in the AD-
CCSR register), the first conversion (8-bit or 10-
bit) accuracy does not meet the accuracy specified
in the datasheet.
Workaround
In order to have the accuracy specified in the
datasheet, the first conversion after a ADC switch-
on has to be ignored.
Note:
This limitation does not apply to Flash silicon rev.
G devices (see Table 32).
15.2 A/D CONVERTER CONVERSION SPEED
Description
Following a change in the fabrication location, the
typical ADC conversion speed value for Flash de-
vices has improved from a previous value of 28s
to 4s.
When migrating software from Rev X to Rev G de-
vices (refer to Table 32) care should be taken
when using ADC interrupts.
Workaround
Firstly, on Rev G devices, only the use of One-
Shot conversion mode is recommended in con-
nection with ADC interrupts.
In Continuous Conversion mode, to avoid getting
trapped in a continuous interrupt, the ADC inter-
rupt routine must always have sufficient time to ex-
ecute completely before the next ADC conversion
interrupt, especially if the ADC interrupt is disabled
outside of this routine. With the shorter conversion
speed value, the interrupt may not be serviced fast
enough. For this reason, on Rev G devices, the
Continuous Conversion mode is not recommend-
ed in connection with ADC interrupts.
Secondly, in the interests of keeping code portable
between all Flash/ROM versions, using the ADC
as a source of a delayed trigger event is not ad-
vised. However, in such a scenario, a delay loop
should be inserted for Rev G Flash devices to en-
sure that the timing remains the same for any such
ADC delayed trigger events.
Device Type
(Silicon Rev.)
Trace Code marked on device/
Internal Sales Type on box
label
Flash Devices (Rev G)
(Latest Flash silicon)
“xxxxxxxxxG” / 72F62xxxxx$x4
Flash Devices (Rev X)
(Previous Flash silicon)
“xxxxxxxxxX” / 72F62xxxxx$x8
“xxxxxxxxxX” / 72F62xxxxx$x9
ROM Devices (Rev Z)
“xxxxxxxxxZ” / 7262xxxxx$x2
“xxxxxxxxxZ” / 7262xxxxx$x3
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