PIC16C770 Datasheet

IC型号：
PIC16C770
PDF描述：
18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-bit A/D
文件大小：
3585.57KB
PDF页数：
220页
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PIC16C717/770/771

2.2.2.8

PCON REGISTER

Note:

The Power Control (PCON) register contains a flag bit

to allow differentiation between a Power-on Reset

(POR) to an external MCLR Reset or WDT Reset.

Those devices with brown-out detection circuitry con-

tain an additional bit to differentiate a Brown-out Reset

condition from a Power-on Reset condition.

The PCON register also contains the frequency select

bit of the INTRC or ER oscillator.

BOR is unknown on Power-on Reset. It

must then be set by the user and checked

on subsequent resets to see if BOR is

clear, indicating a brown-out has occurred.

The BOR status bit is a don鈥檛 care and is

not necessarily predictable if the brown-out

circuit is disabled (by clearing the BODEN

bit in the Configuration word).

U-0

鈥?/div>

bit7

U-0

鈥?/div>

POWER CONTROL REGISTER (PCON: 8Eh)

U-0

鈥?/div>

U-0

鈥?/div>

R/W-1

OSCF

U-0

鈥?/div>

R/W-q

POR

R/W-q

BOR

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

bit 7-4,2:

Unimplemented:

Read as 鈥?鈥?/div>

bit 3:

OSCF:

Oscillator speed

INTRC Mode

= 4 MHz nominal

= 37 KHz nominal

ER Mode

= Oscillator frequency depends on the external resistor value on the OSC1 pin.

= 37 KHz nominal

All other modes

= Ignored

POR:

Power-on Reset Status bit

= No Power-on Reset occurred

= A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)

BOR:

Brown-out Reset Status bit

= No Brown-out Reset occurred

= A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs)

bit 1:

bit 0:

漏

1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 23

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