PIC16LC72A-04/SO Microchip Technology, PIC16LC72A-04/SO Datasheet - Page 18

• Manufacturer Part Number: PIC16LC72A-04/SO
• Description: IC MCU OTP 2KX14 A/D PWM 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16LC72A-04/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

PIC16C62B/72A
2.5
The INDF register is not a physical register. Address-
ing INDF actually addresses the register whose
address is contained in the FSR register (FSR is a
pointer ).
Reading INDF itself indirectly (FSR = 0) will produce
00h. Writing to the INDF register indirectly results in a
no-operation (although STATUS bits may be affected).
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-1.
FIGURE 2-3:
DS35008B-page 18
RP1:RP0
bank select
(1)
Note 1: Maintain clear for upward compatibility with future products.
Indirect Addressing, INDF and FSR
Registers
2: Not implemented.
location select
6
Direct Addressing
DIRECT/INDIRECT ADDRESSING
Data
Memory
from opcode
00h
7Fh
Bank 0
00
0
80h
FFh
Bank 1
01
Preliminary
100h
17Fh
Bank 2
10
(2)
not used
EXAMPLE 2-1:
NEXT
CONTINUE
An effective 9-bit address is obtained by concatenating
the 8-bit FSR register and the IRP bit (STATUS<7>), as
shown in Figure 2-3. However, IRP is not used in the
PIC16C62B/72A.
180h
1FFh
Bank 3
11
(2)
IRP
movlw
movwf
clrf
incf
btfss
goto
:
(1)
bank select
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
0x20
FSR
INDF
FSR
FSR,4 ;all done?
NEXT
7
Indirect Addressing
1999 Microchip Technology Inc.
;initialize pointer
;
;clear INDF register
;inc pointer
;NO, clear next
;YES, continue
FSR register
to RAM
location select
0