PIC16F688 Datasheet, PDF(110/174 Page) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

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PIC16F688 Datasheet, PDF (110/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

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PIC16F688

TABLE 11-4: INITIALIZATION CONDITION FOR REGISTERS (CONTINUED)

Register

Address

Power-on

Reset

â¢ MCLR Reset

â¢ WDT Reset

â¢ Brown-out Detect(1)

â¢ Wake-up from Sleep

through interrupt

â¢ Wake-up from Sleep

through WDT time-out

OSCCON

8Fh

-110 x000

-110 x000

-uuu uuuu

OSCTUNE

90h

---0 0000

---u uuuu

---u uuuu

ANSEL

91h

1111 1111

1111 1111

uuuu uuuu

WPUA

95h

--11 -111

--11 -111

uuuu uuuu

IOCA

96h

--00 0000

--00 0000

--uu uuuu

EEDATH

97h

--00 0000

0000 0000

uuuu uuuu

EEADRH

98h

---- 0000

0000 0000

uuuu uuuu

VRCON

99h

0-0- 0000

0-0- 0000

u-u- uuuu

EEDAT

9Ah

0000 0000

0000 0000

uuuu uuuu

EEADR

9Bh

0000 0000

0000 0000

uuuu uuuu

EECON1

9Ch

x--- x000

u--- q000

u--- uuuu

EECON2

9Dh

---- ----

---- ----

---- ----

ADRESL

9Eh

xxxx xxxx

uuuu uuuu

uuuu uuuu

ADCON1

9Fh

-000 ----

-000 ----

-uuu ----

Legend:

Note 1:

2:

3:

4:

5:

u = unchanged, x = unknown, â = unimplemented bit, reads as â0â, q = value depends on condition.

If VDD goes too low, Power-on Reset will be activated and registers will be affected differently.

One or more bits in INTCON and/or PIR1 will be affected (to cause wake-up).

When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt

vector (0004h).

See Table 11-5 for Reset value for specific condition.

If Reset was due to brown-out, then bit 0 = 0. All other Resets will cause bit 0 = u.

TABLE 11-5: INITIALIZATION CONDITION FOR SPECIAL REGISTERS

Condition

Program

Counter

Status

Register

PCON

Register

Power-on Reset

000h

0001 1xxx

--01 --0x

MCLR Reset during normal operation

000h

000u uuuu

--0u --uu

MCLR Reset during Sleep

000h

0001 0uuu

--0u --uu

WDT Reset

000h

0000 uuuu

--0u --uu

WDT Wake-up

PC + 1

uuu0 0uuu

--uu --uu

Brown-out Detect

Interrupt Wake-up from Sleep

000h

PC + 1(1)

0001 1uuu

uuu1 0uuu

--01 --10

--uu --uu

Legend: u = unchanged, x = unknown, â = unimplemented bit, reads as â0â.

Note 1: When the wake-up is due to an interrupt and Global Interrupt Enable bit, GIE, is set, the PC is loaded with

the interrupt vector (0004h) after execution of PC + 1.

DS41203B-page 108

Preliminary

ï£© 2004 Microchip Technology Inc.

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