PIC16C63A-20E/SS Microchip Technology, PIC16C63A-20E/SS Datasheet - Page 27

• Manufacturer Part Number: PIC16C63A-20E/SS
• Description: IC MCU OTP 4KX14 PWM 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C63A-20E/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SSOP
• For Use With: 309-1025 - ADAPTER 28-SSOP TO 28-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

4.5
The INDF register is not a physical register. Addressing
the INDF register will cause indirect addressing.
Indirect addressing is possible by using the INDF reg-
ister. Any instruction using the INDF register actually
accesses the register pointed to by the File Select Reg-
ister, FSR. Reading the INDF register itself indirectly
(FSR = ’0’) will read 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 4-4.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 4-2.
FIGURE 4-4:
Note 1: For register file map detail, see Figure 4-2.
2000 Microchip Technology Inc.
RP1:RP0
bank select
0
2: Shaded portions are not implemented; maintain the IRP and RP1 bits clear.
Indirect Addressing, INDF and
FSR Registers
location select
6
Direct Addressing
Data
Memory
DIRECT/INDIRECT ADDRESSING
from opcode
00h
7Fh
Bank 0
00
0
80h
FFh
Bank 1
01
PIC16C63A/65B/73B/74B
100h
17Fh
Bank 2
10
not used
EXAMPLE 4-2:
NEXT
CONTINUE
Note:
180h
1FFh
Bank 3
11
Maintain the IRP and RP1 bits clear.
IRP
movlw
movwf
clrf
incf
btfss
goto
:
0
bank select
7
0x20
FSR
INDF
FSR,F
FSR,4
NEXT
Indirect Addressing
INDIRECT ADDRESSING
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done?
;no clear next
;yes continue
FSR register
DS30605C-page 27
location select
0