PIC16C621-04I/SO Microchip Technology, PIC16C621-04I/SO Datasheet - Page 26

• Manufacturer Part Number: PIC16C621-04I/SO
• Description: IC MCU OTP 1KX14 COMP 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C621-04I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 13
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: OTP
• Ram Size: 80 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 18-SOIC (7.5mm Width)
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 96 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 13
• Number Of Timers: 8
• Operating Supply Voltage: 3 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

PIC16C62X
4.4
The INDF register is not a physical register. Addressing
the INDF register will cause indirect addressing.
Indirect addressing is possible by using the INDF
register. Any instruction using the INDF register
actually accesses data pointed to by the File Select
Register (FSR). Reading INDF itself indirectly will
produce 00h. Writing to the INDF register indirectly
results in a no-operation (although STATUS bits may
be affected). An effective 9-bit address is obtained by
concatenating the 8-bit FSR register and the IRP bit
(STATUS<7>), as shown in Figure 4-9. However, IRP
is not used in the PIC16C62X.
A simple program to clear RAM location 20h-7Fh using
indirect addressing is shown in Example 4-1.
FIGURE 4-9:
DS30235J-page 24
RP1
bank select
RP0
Note 1: The RP1 and IRP bits are reserved; always maintain these bits clear.
For memory map detail see (Figure 4-4, Figure 4-5, Figure 4-6 and Figure 4-7).
Indirect Addressing, INDF and
FSR Registers
(1)
location select
6
Direct Addressing
Data
Memory
DIRECT/INDIRECT ADDRESSING PIC16C62X
from opcode
7Fh
00h
Bank 0
00
0
Bank 1
01
Bank 2
10
not used
EXAMPLE 4-1:
NEXT clrf
CONTINUE:
Bank 3
11
movlw
movwf
incf
btfss
goto
IRP
bank select
180h
1FFh
(1)
0x20
FSR
INDF
FSR
FSR,7
NEXT
7
Indirect Addressing
INDIRECT ADDRESSING
 2003 Microchip Technology Inc.
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done?
;no clear next
;yes continue
FSR register
location select
0