PIC16F7X
FIGURE 12-12:
WAKE-UP FROM SLEEP THROUGH INTERRUPT
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
(2)
TOST
CLKOUT(4)
INT pin
INTF Flag
Interrupt Latency
(INTCON<1>)
(Note 2)
GIE bit
Processor in
SLEEP
(INTCON<7>)
INSTRUCTION FLOW
PC
PC
PC+1
PC+2
PC+2
PC + 2
0004h
0005h
Instruction
Inst(0004h)
Inst(PC + 1)
Inst(PC + 2)
Inst(0005h)
Inst(PC) = SLEEP
Fetched
Instruction
Executed
Dummy cycle
Dummy cycle
SLEEP
Inst(PC + 1)
Inst(PC - 1)
Inst(0004h)
Note 1: XT, HS or LP oscillator mode assumed.
2: TOST = 1024 TOSC (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.
For general information of serial programming, please
refer to the In-Circuit Serial Programming (ICSP™)
Guide (DS30277). For specific details on programming
commands and operations for the PIC16F7X devices,
please refer to the latest version of the PIC16F7X
FLASH Program Memory Programming Specification
(DS30324).
12.15 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.
12.16 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.
FIGURE 12-13:
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
To Normal
Connections
12.17 In-Circuit Serial Programming
External
Connector
Signals
*
PIC16F7X
PIC16F7X 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 (see Figure 12-13 for an example). 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 firmware to be pro-
grammed.
+5V
0V
VDD
VSS
VPP
MCLR/VPP
RB6
RB7
CLK
Data I/O
*
*
*
VDD
To Normal
Connections
* Isolation devices (as required).
2002 Microchip Technology Inc.
DS30325B-page 103
MICROCHIP [ MICROCHIP ]
