PIC16C662 [MICROCHIP]
PIC16C662 Rev. A Silicon Errata Sheet; PIC16C662版本A硅勘误表
| 型号： | PIC16C662 |
| 厂家： | 
MICROCHIP |
| 描述： | PIC16C662 Rev. A Silicon Errata Sheet |
| 文件： | 总4页 (文件大小：67K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PIC16C662
PIC16C662 Rev. A Silicon Errata Sheet
The PIC16C662 (Rev. A) parts you have received con-
form functionally to the Device Data Sheet (DS30559A),
except for the anomalies described below.
All the problems listed here will be addressed in future
revisions of the PIC16C662 silicon.
1. Module:Timer0
The TMR0 register may increment when the WDT
postscaler is switched to the Timer0 prescaler. If
TMR0 = FFh, this will cause TMR0 to overflow (set-
ting T0IF).
Work Around
Follow the following sequence:
a) Read the 8-bit TMR0 register into the W register
b) Clear the TMR0 register
c) Assign WDT postscaler to Timer0
d) Write W register to TMR0
2. Programming: Code Protect Bits
The user could see the following error messages
when using PROMATE to program the devices. The
messages are for the configuration bits only.
Work Around
a) After a program or verify, there could be an indica-
tion that there was a config. bit error. If the error
box shows all configuration bits as correct but does
not show the code protect bits (CP), then the
device was properly programmed but code protect
will not operate.
b) When reading in a part, you may get an error that
indicates that the code protect bits are invalid and
the device is unusable. Again, the device was
properly programmed but code protect will not
operate.
In both cases, the part was programmed correctly
but code protect will not operate.
Note: As with any windowed EPROM device, please cover the window at all times, except when erasing.
1998 Microchip Technology Inc.
DS30559A/C662/E2A1-page 1
PIC16C662
3. Module: I/O Ports
Clarifications/Corrections to the Data Sheet:
The specification for the High Voltage Open Drain
I/O (The RA4 pin on most devices) cannot be met
without possible long term reliability issues on that
I/O pin. If a high voltage drive is required, use an
external transistor that can support the required
voltage.
In the Device Data Sheet (DS30559A), the following clar-
ifications and corrections should be noted.
TABLE 1:
DC SPECIFICATION CHANGES FROM DATA SHEET
Data Sheet
New Specification
Specification
Units
Param
No.
Sym.
Characteristic
Min
Typ
Max
Min
Typ
Max
D150
VOD
Open-drain High Voltage
Ñ
Ñ
10
Ñ
Ñ
14
V
DS30559A/C662/E2A1-page 2
1998 Microchip Technology Inc.
PIC16C662
1998 Microchip Technology Inc.
DS30559A/C662/E2A1-page 3
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All rights reserved. © 1999 Microchip Technology Incorporated. Printed in the USA. 11/99
Printed on recycled paper.
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by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products
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1999 Microchip Technology Inc.
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