MCP19124 datasheet(98/236 Pages) MICROCHIP

98 / 236 page

MCP19124/5

DS20005619A-page 98

 2016 Microchip Technology Inc.

13.4

Context Saving During Interrupts

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.

Temporary

holding

registers

W_TEMP

and

STATUS_TEMP should be placed in the last 16 bytes

of GPR. These 16 locations are common to all banks

and do not require banking. This makes context save

and restore operations simpler. The code shown in

Example 13-1 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

bit 0

UVLOIF: VIN Undervoltage Lockout Interrupt Flag bit

With UVLOINTP bit set:

= A VIN Not Undervoltage to VIN Undervoltage edge has been detected

= A VIN Not Undervoltage to VIN Undervoltage edge has not been detected

With UVLOINTN bit set:

= A VIN Undervoltage to VIN Not Undervoltage edge has been detected

= A VIN Undervoltage to VIN Not Undervoltage edge has not been detected

TABLE 13-1:

SUMMARY OF REGISTERS ASSOCIATED WITH INTERRUPTS

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

on Page

INTCON

GIE

PEIE

T0IE

INTE

IOCE

T0IF

INTF

IOCF

OPTION_REG

RAPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

PIE1

TXIE

RCIE

BCLIE

SSPIE

CC2IE

CC1IE

TMR2IE

TMR1IE

PIE2

CDSIE

ADIE

—

OTIE

OVIE

DRUVIE

OVLOIE

UVLOIE

PIR1

TXIF

RCIF

BCLIF

SSPIF

—

TMR2IF

TMR1IF

PIR2

CDSIF

ADIF

—

OTIF

OVIF

DRUVIF

OVLOIF

UVLOIF

Legend: — = unimplemented locations, read as ‘0’. Shaded cells are not used by Interrupts.

PIR2: PERIPHERAL INTERRUPT FLAG REGISTER 2 (CONTINUED)

Note:

The MCP19124/5 do not require saving

the PCLATH. However, if computed

GOTO

s are used in both the ISR and the

main code, the PCLATH must be saved

and restored in the ISR.

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