PIC16F870SLASHP datasheet(103/156 Pages) MICROCHIP

103 / 156 page

Preliminary

DS30569A-page 103

PIC16F870/871

FIGURE 11-12: WAKE-UP FROM SLEEP THROUGH INTERRUPT

11.14

In-Circuit Debugger

When the DEBUG bit in the configuration word is pro-

grammed to a ’0’, the In-Circuit Debugger functionality

is enabled. This function allows simple debugging func-

tions when used with MPLAB. When the microcontrol-

ler has this feature enabled, some of the resources are

not available for general use. Table 11-7 shows which

features are consumed by the background debugger.

TABLE 11-7:

DEBUGGER RESOURCES

To use the In-Circuit Debugger function of the micro-

controller, the design must implement In-Circuit Serial

Programming connections to MCLR/VPP, VDD, GND,

RB7 and RB6. This will interface to the In-Circuit

Debugger module available from Microchip or one of

the third party development tool companies.

11.15

Program Verification/Code Protection

If the code protection bit(s) have not been pro-

grammed, the on-chip program memory can be read

out for verification purposes.

11.16

ID Locations

Four memory locations (2000h - 2003h) are designated

as ID locations where the user can store checksum or

other code-identification numbers. These locations are

not accessible during normal execution but are read-

able and writable during program/verify. It is recom-

mended that only the 4 least significant bits of the ID

location are used.

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

OSC1

CLKOUT(4)

INT pin

INTF flag

(INTCON<1>)

GIE bit

(INTCON<7>)

INSTRUCTION FLOW

Instruction

fetched

Instruction

executed

PC+1

PC+2

Inst(PC) = SLEEP

Inst(PC - 1)

Inst(PC + 1)

SLEEP

Processor in

SLEEP

Interrupt Latency

(Note 2)

Inst(PC + 2)

Inst(PC + 1)

Inst(0004h)

Inst(0005h)

Inst(0004h)

Dummy cycle

PC + 2

0004h

0005h

Dummy cycle

TOST(2)

PC+2

Note 1: XT, HS or LP oscillator mode assumed.

2: TOST = 1024TOSC (drawing not to scale) This delay will not be there for RC osc mode.

3: GIE = ’1’ assumed. In this case after wake- up, the processor jumps to the interrupt routine.

If GIE = ’0’, execution will continue in-line.

4: CLKOUT is not available in these osc modes, but shown here for timing reference.

I/O pins

RB6, RB7

Stack

1 level

Program Memory

Address 0000h must be NOP

Last 100h words

Data Memory

0x070(0x0F0, 0x170, 0x1F0)

0x1EB - 0x1EF

PIC16F870/P Datasheet(PDF) 103 Page - Microchip Technology

PIC16F870/P Datasheet(HTML) 103 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL