PIC16F874-20/L Microchip Technology, PIC16F874-20/L Datasheet - Page 102

• 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
6.3
6.3.1
6.3.2
DS31006A-page 6-8
General Purpose Registers (GPR)
Special Function Registers (SFR)
Data Memory Organization
Data memory is made up of the Special Function Registers (SFR) area, and the General Pur-
pose Registers (GPR) area. The SFRs control the operation of the device, while GPRs are the
general area for data storage and scratch pad operations.
The data memory is banked for both the GPR and SFR areas. The GPR area is banked to allow
greater than 96 bytes of general purpose RAM to be addressed. SFRs are for the registers that
control the peripheral and core functions. Banking requires the use of control bits for bank selec-
tion. These control bits are located in the STATUS Register (STATUS<7:5>).
one of the data memory map organizations, this organization is device dependent.
To move values from one register to another register, the value must pass through the W register.
This means that for all register-to-register moves, two instruction cycles are required.
The entire data memory can be accessed either directly or indirectly. Direct addressing may
require the use of the RP1:RP0 bits. Indirect addressing requires the use of the File Select Reg-
ister (FSR). Indirect addressing uses the Indirect Register Pointer (IRP) bit of the STATUS regis-
ter for accesses into the Bank0 / Bank1 or the Bank2 / Bank3 areas of data memory.
Some Mid-Range MCU devices have banked memory in the GPR area. GPRs are not initialized
by a Power-on Reset and are unchanged on all other resets.
The register file can be accessed either directly, or using the File Select Register FSR, indirectly.
Some devices have areas that are shared across the data memory banks, so a read / write to
that area will appear as the same location (value) regardless of the current bank. We refer to this
area as the Common RAM.
The SFRs are used by the CPU and Peripheral Modules for controlling the desired operation of
the device. These registers are implemented as static RAM.
The SFRs can be classified into two sets, those associated with the “core” function and those
related to the peripheral functions. Those registers related to the “core” are described in this sec-
tion, while those related to the operation of the peripheral features are described in the section
of that peripheral feature.
All Mid-Range MCU devices have banked memory in the SFR area. Switching between these
banks requires the RP0 and RP1 bits in the STATUS register to be configured for the desired
bank. Some SFRs are initialized by a Power-on Reset and other resets, while other SFRs are
unaffected.
The register file can be accessed either directly, or using the File Select Register FSR, indirectly.
Note:
The Special Function Register (SFR) Area may have General Purpose Registers
(GPRs) mapped in these locations.
1997 Microchip Technology Inc.
Figure 6-5
shows