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PIC16C74A-JW

更新时间: 2024-11-30 12:02:35
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描述
PIC16C74A Rev. A Silicon Errata Sheet

PIC16C74A-JW 数据手册

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PIC16C74A  
PIC16C74A Rev. A Silicon Errata Sheet  
The PIC16C74A (Rev. A) parts you have received con-  
form functionally to the Device Data Sheet  
(DS30390E), except for the anomalies described  
below.  
TABLE 1:  
COMPARE OUTPUT LOW  
SWITCHING  
Change CCP to  
All the problems listed here will be addressed in future  
revisions of the PIC16C74A silicon.  
CCPxM<3:0> =  
CCP Mode  
CCPxM<3:0> =  
I/O pin  
State  
1001  
1000  
1. Module: 8-bit A/D Module  
H
L
L
L
L
L
If the Analog Port is configured so that all analog  
pins are digital inputs (PCFG2:PCFG0 = 11x),  
then doing a conversion on any pin of the analog  
port will give a result of ADRES = 0xFF.  
0xxx  
1000  
1001  
101x  
H
L
H
L
L
Work around  
Configure the PCFG2:PCFG0 bits to a value that  
has any pin of the analog port configured as an  
analog input (such as PCFG2:PCFG0 = 100).  
Conversion on any pin of the analog port (analog  
or digital) will now convert as expected.  
H
L
L
L
H
L
L
2. Module: CCP (Compare Mode)  
L
L
The Compare mode may not operate as expected  
when configuring the compare match to drive the  
I/O pin low (CCPxM<3:0> = 1001).  
H
L
L
L
11xx  
L
L
When the CCP module is changed to compare  
output low (CCPxM<3:0> = 1001) from any other  
non-compare CCP mode, the I/O pin will immedi-  
ately be driven low, regardless of the state of the  
I/O data latch. The pin will remain low when the  
compare match occurs (see Table 1).  
Work around  
To have the I/O pin high until the compare match  
low occurs, force a compare match high to get the  
I/O pin into the high state, then reconfigure the  
compare match to force the I/O low when the com-  
pare condition occurs.  
However, when the CCP module is changed to  
compare output high (CCPxM<3:0> = 1000) from  
any other CCP mode, the I/O pin will immediately  
be driven low, regardless of the state of the I/O  
data latch. The pin will be driven high when the  
compare match occurs.  
2001 Microchip Technology Inc.  
DS80089A-page 1  

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