PIC16F874-20/L Microchip Technology, PIC16F874-20/L Datasheet - Page 134

• Manufacturer Part Number: PIC16F874-20/L
• Description: IC MCU FLASH 4KX14 EE 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F874-20/L

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: MSSP, PSP, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164309 - MODULE SKT FOR PM3 44PLCC444-1001 - DEMO BOARD FOR PICMICRO MCUDVA16XL441 - ADAPTER DEVICE ICE 44PLCC309-1040 - ADAPTER 44-PLCC ZIF TO 40-DIP309-1039 - ADAPTER 44-PLCC TO 40-DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Lead Free Status / Rohs Status: Details

PICmicro MID-RANGE MCU FAMILY
DS31008A-page 8-12
Example 8-2
(such as the PIC16C74A). The user register, W_TEMP, must be defined across all banks and
must be defined at the same offset from the bank base address (i.e., W_TEMP is defined at 0x70
- 0x7F in Bank0). The user register, STATUS_TEMP, must be defined in Bank0.
Within the 70h - 7Fh range (Bank0), wherever W_TEMP is expected the corresponding locations
in the other banks should be dedicated for the possible saving of the W register.
The steps of
1.
2.
3.
4.
5.
If additional locations need to be saved before executing the Interrupt Service Routine (ISR)
code, they should be saved after the STATUS register is saved (step 2), and restored before the
STATUS register is restored (step 4).
Example 8-2: Saving the STATUS and W Registers in RAM
Stores the W register regardless of current bank.
Stores the STATUS register in Bank0.
Executes the Interrupt Service Routine (ISR) code.
Restores the STATUS (and bank select bit register).
Restores the W register.
MOVWF
SWAPF
BCF
MOVWF
:
: (Interrupt Service Routine (ISR) )
:
SWAPF
MOVWF
SWAPF
SWAPF
Example
stores and restores the STATUS and W registers for devices without common RAM
(for Devices without Common RAM)
W_TEMP
STATUS,W
STATUS,RP0
STATUS_TEMP
STATUS_TEMP,W
STATUS
W_TEMP,F
W_TEMP,W
8-2:
; Copy W to a Temporary Register
;
; Swap STATUS nibbles and place
;
; Change to Bank0 regardless of
;
; Save STATUS to a Temporary register
;
; Swap original STATUS register value
;
; Restore STATUS register from
;
; Swap W_Temp nibbles and return
;
; Swap W_Temp to W to restore original
;
regardless of current bank
into W register
current bank
in Bank0
into W (restores original bank)
W register
value to W_Temp
W value without affecting STATUS
1997 Microchip Technology Inc.