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PIC16F874-04I/PQ 其他数据使用手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
MQFP-44
描述:
PIC16 系列 192 B RAM 7 kB 闪存 8位 CMOS 微控制器 - MQFP-44
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PIC16F874-04I/PQ数据手册
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1999 Microchip Technology Inc. DS80051C-page 1
PIC16F87X
The PIC16F87X (Rev. B5) parts you have received
conform functionally to the Device Data Sheet
(DS30292A), except for the anomalies described
below.
All the problems listed here will be addressed in future
revisions of the PIC16F87X silicon.
This errata applies to the PIC16F877-20/P production
version with an assembly date code of 9925 or greater
and all other production versions of the PIC16F87X
family.
1. Module: Electrical Specifications
The Supply Voltage specification has not yet met
the design target (data sheet specification). The
specification for these devices is shown in Table 1.
2. Module: A/D Specifications
The Offset Error specification has not yet met the
design target (data sheet specification). The spec-
ification for these devices is shown in Table 1.
3. Module: TMR1
When operating in external clock mode (TMR1CS
is set), reading either of the timer 1 registers
(TMR1H or TMR1L) may cause the timer not to
increment as expected. This occurs for both syn-
chronous and asynchronous inputs.
The scenarios which display this are:
a) When a read operation of the TMR1H regis-
ter occurs, the TMR1L register may not
increment.
b) When a read operation of the TMR1L regis-
ter occurs, the TMR1H register may not
increment. This improper operation is only
an issue when the TMR1L register incre-
ments from FFh to 00h (FFh → 00H) during
the read of the TMR1L register.
Work Around
Do not read either the TMR1H or the TMR1L reg-
isters when operating in external clock mode
(TMR1CS is set). If the application needs to read
the 16-bit counter, evaluate if this function can be
moved to the TMR0 or one of the other timer
resources on the device.
TABLE 1: DC SPECIFICATION CHANGES FROM DATA SHEET
Param
No.
Sym. Characteristic
Tested Specification
Data Sheet
Specification
Units
Min Typ Max Min Typ Max
D001 V
DD Supply Voltage 2.5 —5.5 2.0—5.5 V
A06 EOFF Offset Error — — < ± 2 — — < ± 1 LSb
PIC16F87X Rev. B5 Silicon Errata Sheet
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