PIC16C432-E/SS Microchip Technology, PIC16C432-E/SS Datasheet - Page 57

• Manufacturer Part Number: PIC16C432-E/SS
• Description: IC MCU CMOS 8BIT 20MHZ 2K 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C432-E/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: LIN (Local Interconnect Network)
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• For Use With: XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC164307 - MODULE SKT FOR PM3 28SSOPAC164029 - MODULE SKT PROMATEII 20DIP/SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

9.6
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key reg-
isters during an interrupt (i.e., W register and STATUS
register). This will have to be implemented in software.
Example 9-7 stores and restores the STATUS and W
registers. The user register, W_TEMP, must be defined
in both banks and must be defined at the same offset
from the bank base address (i.e., W_TEMP is defined
at 0x70 in Bank 0 and it must also be defined at 0xF0
in Bank 1). The user register, STATUS_TEMP, must be
defined in Bank 0. The Example 9-7:
• Stores the W register
• Stores the STATUS register in Bank 0
• Executes the ISR code
• Restores the STATUS (and bank select bit
• Restores the W register
EXAMPLE 9-7:
MOVW
F
SWAP
F
BCF
MOVW
F
:
:
:
SWAP
F
MOVW
F
SWAP
F
SWAP
F
register)
2002 Microchip Technology Inc.
Context Saving During Interrupts
W_TEMP
STATUS,W
STATUS,RP0
STATUS_TEMP ;save status to bank 0
(ISR)
STATUS_TEMP
,W
STATUS
W_TEMP,F
W_TEMP,W
SAVING THE STATUS
AND W REGISTERS IN
RAM
;copy W to temp register,
;could be in either bank
;swap status to be saved
into W
;change to bank 0 regard-
less
;of current bank
;register
;swap STATUS_TEMP regis-
ter
;into W, sets bank to
original
;state
;move W into STATUS regis-
ter
;swap W_TEMP
;swap W_TEMP into W
Preliminary
PIC16C432
DS41140B-page 55