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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SPDIP 28 8-Bit 4 MHz I/O number 20

PIC14C000



1999 Microchip Technology Inc. DS80057A-page 1

The PIC14C000 parts you have received conform func-

tionally to the PIC14C000 data sheet (DS40122B),

except for the anomalies described below.

USING AN1 AND AN5 AS ANALOG INPUTS

1. Analog inputs AN1 and AN5 can not be used if

their level-shift network is disabled. According to

Section 9.2 of the PIC14C000 data sheet,

(DS40122B), the level-shift network feature can be

turned off by setting the LSOFF bit (SLPCON<4>).

However, doing so will cause the AN1 and AN5

inputs to go to V

DD, rendering them unusable as

analog input channels. Therefore, the LSOFF bit

must remain cleared. The other functions associ-

ated with these pins, such as the current zeroing

and filtering switches, operate as specified. The

AN1 and AN5 pins can still be used for ADC oper-

ations, but a small firmware routine is required to

ensure accurate results. This routine can be imple-

mented by following the steps below:

• Ensure the LSOFF bit (SLPCON<4>) is

cleared.

• Ensure a good zero-level on AN1 and/or AN5

by setting the ADZERO bit (ADCON0<0>).

• Perform an A/D conversion as normal and keep

the count from ADCAPH and ADCAPL in user-

defined RAM. This is the representative digital

count for the exact level-shift value.

• Enable the signal of interest onto AN1 and/or

AN5.

• Perform another A/D conversion and keep the

count in ADCAPH and ADCAPL. This is the

representative digital count for the sum of the

signal of interest and the exact level-shift value.

• Subtract the level-shift count from the represen-

tative count for the sum.

• This result will be the representative count for

the signal of interest alone.

USING THE I

C™ MODULE IN SMBus MODE

2. The I

C Module in the PIC14C000 can be used

with either PORTC<7:6> or PORTD<1:0> to pro-

vide the clock and data signal connections.

According to Figure 7-16 of the PIC14C000 data

sheet (DS40122B), the MISC<bit 3>, SMBus bit,

allows user to select the input thresholds of

PORTC<7:6> and PORTD<1:0> to either be

SMBus-compatible or Schmitt Trigger-compatible.

Although the data sheet says that PORTC<7:6>

operates the same way as PORTD<1:0>, in the

actual implementation, PORTC<7:6> always uses

the Schmitt Trigger input thresholds when the I

module reads through PORTC<7:6>, even if the

SMBus mode is selected.

If PORTC<7:6> are read as port inputs, while the

SMBus mode is selected, the SMBus voltage levels

are used.

Interfacing to an SMBus port can still be imple-

mented using either of the following methods:

• Use the I

C module together with

PORTD<1:0>, and set the MISC<3> bit high.

• Use PORTC<7:6> or PORTD<1:0> with the

MISC<3> bit set high, and perform the I

function in firmware.

Errata Sheet for PIC14C000 Revision A

Summary of content (5 pages)

PAGE 1
PIC14C000 Errata Sheet for PIC14C000 Revision A The PIC14C000 parts you have received conform functionally to the PIC14C000 data sheet (DS40122B), except for the anomalies described below. USING AN1 AND AN5 AS ANALOG INPUTS 1. Analog inputs AN1 and AN5 can not be used if their level-shift network is disabled. According to Section 9.2 of the PIC14C000 data sheet, (DS40122B), the level-shift network feature can be turned off by setting the LSOFF bit (SLPCON<4>).
PAGE 2
PIC14C000 Clarifications/Corrections to the Data Sheet: In the PIC14C000 Device Data Sheet (document DS40122B), the following clarifications and corrections should be noted: 1. Module: A/D The operating current specifications during SLEEP have been modified to the values shown in Table 1. TABLE 1: A/D CONVERTER OPERATING CURRENT DURING SLEEP MODE New Specification Data Sheet Specification Symbol Characteristics IPD1 IPD1 2.
PAGE 3
PIC14C000 4. Module: Bandgap Voltage Reference The condition for the Output Voltage specification has been added as shown in Table 4. TABLE 4: BANDGAP OUTPUT VOLTAGE SPECIFICATION New Specification Symbol VO(VREF) Output Voltage 5. Data Sheet Specification Characteristics Units Min Typ Max Min Typ Max 1.14 1.19 1.24 1.14 1.19 1.24 V Conditions TA = 25°C Module: Temperature Sensor The Output linearity specification has been modified to the values shown in Table 5.
PAGE 4
Note the following details of the code protection feature on PICmicro® MCUs. • • • • • • The PICmicro family meets the specifications contained in the Microchip Data Sheet. Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 5
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