PIC16C770 datasheet(2/6 Pages) MICROCHIP

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PIC16C717/770/771

DS80100C-page 2

Module: ECCP (Compare Mode)

The CCP1 output latch, observed on RB3/CCP1/

P1A, can change unexpectedly when the ECCP

module is changed from a set output on match

(CCP1CON<3:0> = “1000”) to clear output on

match (CCP1CON<3:0> = “1001”) or vice versa.

This condition will occur, following an ECCP

Reset, at the third iteration of the following

sequence:

CCPR1<3:0> is changed from “1001” to

“1000” or vice versa.

The TMR1H:TMR1L register pair matches

the CCP1R1H:CCPR1L register pair.

Step 1 of the third iteration will cause the CCP1

output latch to immediately, and erroneously,

change to the inverse of the CCPR1<0> bit. This

gives the appearance of an inverted ECCP

response to the third, and subsequent, compare

match events.

The apparent inverted response will persist until

the CCP1CON<3> bit is cleared (exiting Compare

mode). Interrupts always occur correctly on the

match condition. The error is only in the state of the

CCP1 output latch.

Work around

Option 1

Use the ECCP toggle output on compare match

mode (CCP1CON<3:0> = “0010”).

Option 2

Do not selectively change the CCP1CON<0> bit.

Instead, perform the following:

• Set the RB3 data latch to the same state as

the CCP1 output latch (movf PORTB, f) to

avoid an output glitch when the CCP1CON

• Next, clear the CCP1CON register (clrf

CCP1CON).

• Finally, set the CCP1CON<3:0> bits to the

next desired output on Compare Match

mode.

TABLE 1:

DC SPECIFICATION DEVIATIONS FROM DATA SHEET

TABLE 2:

DC SPECIFICATION DEVIATIONS FROM DATA SHEET

Param

No.

Sym.

Characteristic

Tested Specification

Data Sheet

Specification

Units

Min

Typ

Max

Min

Typ

Max

D005

VBOR BOR Voltage

BORV<1:0> = 0100

2.35

—

2.80

2.5

—

2.66

BORV<1:0> = 0101

2.55

—

3.02

2.7

—

2.86

BORV<1:0> = 0110

3.95

—

4.71

4.2

—

4.46

BORV<1:0> = 0111

4.23

—

5.05

4.5

—

4.78

Param

No.

Sym.

Characteristic

Tested Specification

Data Sheet

Specification

Units

Min

Typ

Max

Min

Typ

Max

D420

VLVD LVD Voltage

LVV<3:0> = 0100

2.35

—

2.80

2.5

—

2.66

LVV<3:0> = 0101

2.55

—

3.02

2.7

—

2.86

LVV<3:0> = 0110

2.64

—

3.14

2.8

—

2.98

LVV<3:0> = 0111

2.83

—

3.37

3.0

—

3.2

LVV<3:0> = 1000

3.11

—

3.71

3.3

—

3.52

LVV<3:0> = 1001

3.29

—

3.93

3.5

—

3.72

LVV<3:0> = 1010

3.39

—

4.04

3.6

—

3.84

LVV<3:0> = 1011

3.58

—

4.26

3.8

—

4.04

LVV<3:0> = 1100

3.77

—

4.49

4.0

—

4.26

LVV<3:0> = 1101

3.95

—

4.71

4.2

—

4.46

LVV<3:0> = 1110

4.23

—

5.05

4.5

—

4.78

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