PIC16F877-20/P Microchip Technology, PIC16F877-20/P Datasheet - Page 88

• Manufacturer Part Number: PIC16F877-20/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-20/P

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K 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: 256 x 8
• Ram Size: 368 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: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
5.6
DS31005A-page 5-6
STATUS Register
The STATUS register, shown in
status and the bank select bits for data memory. Since the selection of the Data Memory banks
is controlled by this register, it is required to be present in every bank. Also, this register is in the
same relative position (offset) in each bank (see
ory Organization”
The STATUS register can be the destination for any instruction, as with any other register. If the
STATUS register is the destination for an instruction that affects the Z, DC or C bits, then the write
to these three bits is disabled. These bits are set or cleared according to the device logic. Fur-
thermore, the TO and PD bits are not writable. Therefore, the result of an instruction with the
STATUS register as destination may be different than intended.
For example, CLRF STATUS will clear the upper-three bits and set the Z bit. This leaves the
STATUS register as 000u u1uu (where u = unchanged).
It is recommended, therefore, that only BCF, BSF, SWAPF and MOVWF instructions are used to
alter the STATUS register because these instructions do not affect the Z, C or DC bits from the
STATUS register. For other instructions, not affecting any status bits, see
Note 1: Some devices do not require the IRP and RP1 (STATUS<7:6>) bits. These bits are
Note 2: The C and DC bits operate as a borrow and digit borrow bit, respectively, in subtrac-
not used by the Section 5. CPU and ALU and should be maintained clear. Use of
these bits as general purpose R/W bits is NOT recommended, since this may affect
upward code compatibility with future products.
tion.
section).
Figure
5-1, contains the arithmetic status of the ALU, the RESET
Figure 6-5: “Register File Map”
1997 Microchip Technology Inc.
Table
5-1.
in the
“Mem-