PIC16C72-04SLASHSP datasheet(72/124 Pages) MICROCHIP

72 / 124 page

PIC16C72 Series

DS39016A-page 72

Preliminary

FIGURE 10-14: WAKE-UP FROM SLEEP THROUGH INTERRUPT

10.14

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.

10.15

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.

For ROM devices, these values are submitted along

with the ROM code.

10.16

In-Circuit Serial Programming™

PIC16CXXX family microcontrollers can be serially

programmed while in the end application circuit. This is

simply done with two lines for clock and data, and three

other lines for power, ground, and the programming

voltage. This allows customers to manufacture boards

with unprogrammed devices, and then program the

microcontroller just before shipping the product. This

also allows the most recent ﬁrmware or a custom ﬁrm-

ware to be programmed.

For complete details of serial programming, please

refer to the In-Circuit Serial Programming (ICSP™)

Guide, DS30277.

Q3 Q4

Q1 Q2

Q2 Q3 Q4

Q1 Q2 Q3 Q4

Q2 Q3

Q1 Q2

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

XT, HS or LP oscillator mode assumed.

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

GIE = '1' assumed. In this case after wake- up, the processor jumps to the interrupt routine. If GIE = '0', execution will continue in-line.

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

Note:

Microchip does not recommend code pro-

tecting windowed devices.

PIC16C72-04/SP Datasheet(PDF) 72 Page - Microchip Technology

PIC16C72-04/SP Datasheet(HTML) 72 Page - Microchip Technology

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