PIC16C54C-04/SO【PDF 109/194 页】IC MCU OTP 512X12 18SOIC

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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 19

PIC16C5X

5.0

RESET

PIC16C5X devices may be RESET in one of the follow-

ing ways:

Power-On Reset (POR)

MCLR Reset (normal operation)

MCLR Wake-up Reset (from SLEEP)

WDT Reset (normal operation)

WDT Wake-up Reset (from SLEEP)

Table 5-1 shows these RESET conditions for the PCL

and STATUS registers.

Some registers are not affected in any RESET condi-

tion. Their status is unknown on POR and unchanged

in any other RESET. Most other registers are reset to a

“RESET state” on Power-On Reset (POR), MCLR or

WDT Reset. A MCLR or WDT wake-up from SLEEP

also results in a device RESET, and not a continuation

of operation before SLEEP.

The TO and PD bits (STATUS <4:3>) are set or cleared

depending on the different RESET conditions (Table 5-

1). These bits may be used to determine the nature of

the RESET.

Table 5-3 lists a full description of RESET states of all

registers. Figure 5-1 shows a simplified block diagram

of the On-chip Reset circuit.

TABLE 5-1:

STATUS BITS AND THEIR SIGNIFICANCE

TABLE 5-2:

SUMMARY OF REGISTERS ASSOCIATED WITH RESET

Condition

Power-On Reset

MCLR Reset (normal operation)

MCLR Wake-up (from SLEEP)

WDT Reset (normal operation)

WDT Wake-up (from SLEEP)

Legend:

= unchanged, x = unknown, — = unimplemented read as ’0’.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

Value on

MCLR and

WDT Reset

03h

STATUS

PA2

PA1

PA0

0001 1xxx

000q quuu

Legend:

u = unchanged, x = unknown, q = see Table 5-1 for possible values.

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