PIC16F84A datasheet(142/337 Pages) MICROCHIP

142 / 337 page

PIC16C6X

DS30234D-page 142

FIGURE 13-22: WAKE-UP FROM SLEEP THROUGH INTERRUPT

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.

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

13.9

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.

13.10

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.

13.11

In-Circuit Serial Programming

The PIC16CXX microcontrollers can be serially pro-

grammed 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.

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

Note:

Microchip does not recommend code pro-

tecting windowed devices.

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

The device is placed into a program/verify mode by

holding pins RB6 and RB7 low while raising the MCLR

(VPP) pin from VIL to VIHH (see programming speciﬁca-

tion). RB6 becomes the programming clock and RB7

becomes the programming data. Both RB6 and RB7

are Schmitt Trigger inputs in this mode.

After reset, to place the device in program/verify mode,

the program counter (PC) is at location 00h. A 6-bit

command is then supplied to the device. Depending on

the command, 14-bits of program data are then sup-

plied to or from the device, depending if the command

was a load or a read. For complete details of serial pro-

gramming, please refer to the PIC16C6X/7X Program-

ming Speciﬁcations (Literature #DS30228).

FIGURE 13-23: TYPICAL IN-CIRCUIT SERIAL

PROGRAMMING

CONNECTION

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16CXX

VDD

VSS

MCLR/VPP

RB6

RB7

+5V

VPP

CLK

Data I/O

VDD

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