PIC16LC72-10IL View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16LC72-10IL Datasheet PDF : 288 Pages
| |||
PIC16C7X
FIGURE 14-20: WAKE-UP FROM SLEEP THROUGH INTERRUPT
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
OSC1
CLKOUT(4)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
TOST(2)
INT pin
INTF flag
(INTCON<1>)
GIE bit
(INTCON<7>)
Processor in
SLEEP
Interrupt Latency
(Note 2)
INSTRUCTION FLOW
PC
PC
Instruction
fetched
Instruction
executed
Inst(PC) = SLEEP
Inst(PC - 1)
PC+1
Inst(PC + 1)
SLEEP
PC+2
PC+2
Inst(PC + 2)
Inst(PC + 1)
PC + 2
Dummy cycle
0004h
Inst(0004h)
Dummy cycle
0005h
Inst(0005h)
Inst(0004h)
Note 1:
2:
3:
4:
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.
14.9
Program Verification/Code Protection
Applicable Devices
72 73 73A 74 74A 76 77
If the code protection bit(s) have not been pro-
grammed, the on-chip program memory can be read
out for verification purposes.
Note: Microchip does not recommend code pro-
tecting windowed devices.
14.10 ID Locations
Applicable Devices
72 73 73A 74 74A 76 77
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.
14.11
In-Circuit Serial Programming
Applicable Devices
72 73 73A 74 74A 76 77
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.
The device is placed into a program/verify mode by
holding the RB6 and RB7 pins low while raising the
MCLR (VPP) pin from VIL to VIHH (see programming
specification). 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 into programming/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 14-21: TYPICAL IN-CIRCUIT SERIAL
PROGRAMMING
CONNECTION
External
Connector
Signals
+5V
0V
VPP
CLK
Data I/O
To Normal
Connections
PIC16CXX
VDD
VSS
MCLR/VPP
RB6
RB7
VDD
To Normal
Connections
DS30390E-page 146
© 1997 Microchip Technology Inc.
Share Link: 