PIC16F916-I/SO Microchip Technology Inc., PIC16F916-I/SO Datasheet - Page 200
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PIC16F916-I/SO
Manufacturer Part Number
PIC16F916-I/SO
Description
28 PIN, 14 KB FLASH, 352 RAM, 25 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F916-ISO.pdf
(272 pages)
Specifications of PIC16F916-I/SO
A/d Inputs
5-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
14K Bytes
Ram Size
352 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PIC16F916-I/SO
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 200 of 272
- Download datasheet (5Mb)
PIC16F917/916/914/913
16.5
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key
registers during an interrupt (e.g., W and Status
registers). This must be implemented in software.
Since the lower 16 bytes of all banks are common in the
PIC16F917/916/914/913 (see Figure 2-3), temporary
holding registers, W_TEMP and STATUS_TEMP,
should be placed in here. These 16 locations do not
require banking and therefore, make it easier to context
save and restore. The same code shown in
Example 16-1 can be used to:
• Store the W register
• Store the Status register
• Execute the ISR code
• Restore the Status (and Bank Select Bit register)
• Restore the W register
EXAMPLE 16-1:
DS41250E-page 198
Note:
MOVWF
SWAPF
CLRF
MOVWF
:
:(ISR)
:
SWAPF
MOVWF
SWAPF
SWAPF
Context Saving During Interrupts
The PIC16F917/916/914/913
does not require saving the PCLATH.
However, if computed GOTO’s are used in
the ISR and the main code, the PCLATH
must be saved and restored in the ISR.
W_TEMP
STATUS,W
STATUS
STATUS_TEMP
STATUS_TEMP,W
STATUS
W_TEMP,F
W_TEMP,W
SAVING STATUS AND W REGISTERS IN RAM
;Copy W to TEMP register
;Swap status to be saved into W
;bank 0, regardless of current bank, Clears IRP,RP1,RP0
;Save status to bank zero STATUS_TEMP register
;Insert user code here
;Swap STATUS_TEMP register into W
;(sets bank to original state)
;Move W into Status register
;Swap W_TEMP
;Swap W_TEMP into W
normally
Preliminary
© 2005 Microchip Technology Inc.
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