PIC16HV540-04I/SS Microchip Technology, PIC16HV540-04I/SS Datasheet - Page 17

• Manufacturer Part Number: PIC16HV540-04I/SS
• Description: IC MCU OTP 512X12 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16HV540-04I/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 768B (512 x 12)
• Program Memory Type: OTP
• Ram Size: 25 x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 15 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Processor Series: PIC16H
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 25 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 8
• Operating Supply Voltage: 3.5 V to 15 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• For Use With: 309-1016 - ADAPTER 20-SSOP TO 18-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

4.8
The INDF register is not a physical register. Addressing
INDF actually addresses the register whose address is
contained in the FSR register (FSR is a pointer). This is
indirect addressing.
EXAMPLE 4-3:
• Register file 05 contains the value 10h
• Register file 06 contains the value 0Ah
• Load the value 05 into the FSR register
• A read of the INDF register will return the value
• Increment the value of the FSR register by one
• A read of the INDR register now will return the
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 10h-1Fh
using indirect addressing is shown in Example 4-4.
FIGURE 4-4:
of 10h
(FSR = 06)
value of 0Ah.
2000 Microchip Technology Inc.
Indirect Data Addressing; INDF and
FSR Registers
(Note 1)
DIRECT/INDIRECT ADDRESSING
(FSR)
6
INDIRECT ADDRESSING
5
Direct Addressing
location select
Note 1:
Data
Memory
4
2:
(opcode)
(2)
Bits 5 and 6 are unimplemented and read as 1’s.
For register map detail, see Section 4.2.
00h
0Fh
10h
0
1Fh
Preliminary
Bank 0
EXAMPLE 4-4:
NEXT
CONTINUE
The FSR is a 5-bit (PIC16HV540) wide register. It is
used in conjunction with the INDF register to indirectly
address the data memory area.
The FSR<4:0> bits are used to select data memory
addresses 00h to 1Fh.
PIC16HV540: Do not use banking. FSR<6:5> are
unimplemented and read as '1's.
(Note 1)
6
Indirect Addressing
5
movlw
movwf
clrf
incf
btfsc
goto
:
4
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
location select
(FSR)
PIC16HV540
0x10
FSR
INDF
FSR,F
FSR,4
NEXT
;YES, continue
0
;initialize pointer
; to RAM
;clear INDF register
;inc pointer
;all done?
;NO, clear next
DS40197B-page 17