PIC16F819-I/SO Microchip Technology Inc., PIC16F819-I/SO Datasheet - Page 11

• Manufacturer Part Number: PIC16F819-I/SO
• Description: 18 PIN, 3.5 KB FLASH, 256 RAM, 16 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F819-I/SO

• A/d Inputs: 5-Channel, 10-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 16
• Interface: I2C/SPI
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin SOIC
• Programmable Memory: 3.5K Bytes
• Ram Size: 256 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

2.0
There are two memory blocks in the PIC16F818/819.
These are the program memory and the data memory.
Each block has its own bus, so access to each block
can occur during the same oscillator cycle.
The data memory can be further broken down into the
general purpose RAM and the Special Function
Registers (SFRs). The operation of the SFRs that
control the “core” are described here. The SFRs used
to control the peripheral modules are described in the
section discussing each individual peripheral module.
The data memory area also contains the data
EEPROM memory. This memory is not directly mapped
into the data memory but is indirectly mapped. That is,
an indirect address pointer specifies the address of the
data EEPROM memory to read/write. The PIC16F818
device’s 128 bytes of data EEPROM memory have the
address range of 00h-7Fh and the PIC16F819 device’s
256 bytes of data EEPROM memory have the address
range of 00h-FFh. More details on the EEPROM
memory can be found in Section 3.0 “Data EEPROM
and Flash Program Memory”.
Additional information on device memory may be found
in the “PICmicro
(DS33023).
FIGURE 2-1:
 2004 Microchip Technology Inc.
Program
On-Chip
Memory
CALL, RETURN
RETFIE, RETLW
MEMORY ORGANIZATION
®
Mid-Range Reference Manual”
Interrupt Vector
Stack Level 8
0000h-03FFh
Stack Level 2
PROGRAM MEMORY MAP
AND STACK FOR
PIC16F818
Stack Level 1
Reset Vector
PC<12:0>
Wraps to
Page 0
13
0000h
0004h
0005h
03FFh
0400h
1FFFh
2.1
The PIC16F818/819 devices have a 13-bit program
counter capable of addressing an 8K x 14 program
memory space. For the PIC16F818, the first 1K x 14
(0000h-03FFh)
Figure 2-1). For the PIC16F819, the first 2K x 14 is
located at 0000h-07FFh (see Figure 2-2). Accessing a
location above the physically implemented address will
cause a wraparound. For example, the same instruc-
tion will be accessed at locations 020h, 420h, 820h,
C20h, 1020h, 1420h, 1820h and 1C20h.
The Reset vector is at 0000h and the interrupt vector is
at 0004h.
FIGURE 2-2:
Program
On-Chip
Memory
CALL, RETURN
RETFIE, RETLW
Program Memory Organization
PIC16F818/819
is
Interrupt Vector
physically
Stack Level 8
0000h-07FFh
Stack Level 2
Stack Level 1
Reset Vector
PROGRAM MEMORY MAP
AND STACK FOR
PIC16F819
PC<12:0>
Wraps to
Page 0
13
implemented
DS39598E-page 9
0000h
0004h
0005h
07FFh
0800h
1FFFh
(see