PIC16LC774-I/P View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16LC774-I/P Datasheet PDF : 202 Pages
| |||
PIC16C77X
FIGURE 12-14: 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.
12.14 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.
Note: Microchip does not recommend code pro-
tecting windowed devices.
12.15 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.
12.16 In-Circuit Serial Programming
PIC16CXXX 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.
For complete details of serial programming, please
refer to the In-Circuit Serial Programming (ICSP™)
Guide, (DS30277).
1999-2013 Microchip Technology Inc.
Advance Information
DS30275B-page 141
Share Link: 