PIC16F886-I/ML【PDF 12/16 页】IC PIC MCU FLASH 8KX14 28QFN

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Sheet目录3873

8页 9页 10页 11页 [12页]13页 14页 15页 16页

2009 Microchip Technology Inc.

DS80302F-page 5

PIC16F88X

Module: Analog-To-Digital Converter

(ADC) Module

Selecting the VP6 reference as the analog input

source

(CHS<3:0> = 1111)

for

the

ADC

conversion after sampling another analog channel

with input voltages approximately greater than

3.6V can temporarily disturb the HFINTOSC

oscillator.

Work around

Select an ADC channel with input voltages lower

than 3.6V prior to selecting the VP6 reference

voltage input. Any analog channel can be used,

even if that channel is configured as a digital I/O

(configured as an output) that is driving the output

pin low. An alternative is to configure the CVREF

module to output a voltage less than 3.6V and then

selecting that analog channel CHS<3:0> = 1110

as the analog input source.

EXAMPLE 2:

AVOID DISTURBING THE

HFINTOSC OSCILLATOR

Affected Silicon Revisions

PIC16F882

PIC16F883/PIC16F884

PIC16F886/PIC16F887

Module: MSSP (SPI Master Mode)

With MSSP in SPI Master mode, FOSC/64 or

Timer2/2 clock rate and CKE = 0, a write collision

may occur if SSPBUF is loaded immediately after

the transfer is complete. A delay may be required

after the MSSP Interrupt Flag bit, SSPIF, is set or

the Buffer Full bit, BF, is set and before writing

SSPBUF. If the delay is insufficiently short, a write

collision may occur as indicated by the WCOL bit

being set.

Work around

Add a software delay of one SCK period after

detecting the completed transfer and prior to

updating the SSPBUF contents. Verify the WCOL

bit is clear after writing SSPBUF. If the WCOL is

set, clear the bit in software and rewrite the

SSPBUF register.

Date Codes that pertain to this issue:

All engineering and production devices.

Affected Silicon Revisions

PIC16F882

PIC16F883/PIC16F884

PIC16F886/PIC16F887

Note:

This only occurs when selecting the

VP6 reference ADC channel using the

CHS<3:0>

bits

the

ADCON0

actual ADC conversion using the

GO/DONE bit in the ADCON0 register.

BANKSEL

ADCON0

;

MOVLW

B’XX111001’

;Select ADC

MOVWF

ADCON0

;Channel CVREF

MOVLW

B’XX111101’

;Select ADC

MOVWF

ADCON0

;Channel VP6

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