PIC16C662-20/P Microchip Technology, PIC16C662-20/P Datasheet - Page 68
![IC MCU OTP 4KX14 COMP 40DIP](/photos/6/61/66192/150-40-dip_sml.jpg)
PIC16C662-20/P
Manufacturer Part Number
PIC16C662-20/P
Description
IC MCU OTP 4KX14 COMP 40DIP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16C662-20/P
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Peripherals
Brown-out Detect/Reset, LED, POR, WDT
Number Of I /o
33
Program Memory Size
7KB (4K x 14)
Program Memory Type
OTP
Ram Size
176 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 6 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Processor Series
PIC16C
Core
PIC
Data Bus Width
8 bit
Data Ram Size
176 B
Interface Type
RS- 232
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
33
Number Of Timers
8
Operating Supply Voltage
3 V to 6 V
Maximum Operating Temperature
+ 70 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
ICE2000, DM163022
Minimum Operating Temperature
0 C
On-chip Adc
10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16C662-20/PQ
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC16C662-20/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
PIC16C64X & PIC16C66X
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 e.g. W register and STATUS
register. This will have to be implemented in software.
Example 9-1 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 - 0x7F in Bank 0). The user register,
STATUS_TEMP, must be defined in Bank 0.
EXAMPLE 9-1:
MOVWF
SWAPF
BCF
MOVWF
SWAPF
MOVWF
SWAPF
SWAPF
DS30559A-page 68
:
: (Interrupt Service Routine)
:
Context Saving During Interrupts
W_TEMP
STATUS,W
STATUS,RP0
STATUS_TEMP
STATUS_TEMP,W
STATUS
W_TEMP,F
W_TEMP,W
SAVING THE STATUS AND W REGISTERS IN RAM
; Copy W to a Temporary Register regardless of current bank
; Swap STATUS nibbles and place into W register
; Change to Bank 0 regardless of current bank
; Save STATUS to a Temporary register in Bank 0
; Swap original STATUS register value into W (restores original bank)
; Restore STATUS register from W register
; Swap W_Temp nibbles and return value to W_Temp
; Swap W_Temp to W to restore original W value without affecting STATUS
Preliminary
Example 9-1:
• Stores the W register regardless of current bank
• Stores the STATUS register in Bank 0
• Executes the ISR code
• Restores the STATUS (and bank select bit
• Restores the W register
register)
1996 Microchip Technology Inc.