PIC16F946T-I/PT Microchip Technology, PIC16F946T-I/PT Datasheet - Page 28

• Manufacturer Part Number: PIC16F946T-I/PT
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F946T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16F946
2.5
The INDF register is not a physical register. Addressing
the INDF register will cause indirect addressing.
Indirect addressing is possible by using the INDF
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 2-4.
A simple program to clear RAM location 20h-2Fh using
indirect addressing is shown in Example 2-2.
FIGURE 2-4:
DS41265A-page 26
Bank Select
RP1
Note:
Indirect Addressing, INDF and
FSR Registers
RP0
Direct Addressing
6
For memory map detail, see Figure 2-1.
Data
Memory
Location Select
DIRECT/INDIRECT ADDRESSING PIC16F946
From Opcode
7Fh
00h
Bank 0
00
0
Bank 1
01
Preliminary
Bank 2
10
EXAMPLE 2-2:
NEXTCLRF
CONTINUE
Bank 3
MOVLW
MOVWF
INCF
BTFSS
GOTO
11
IRP
Bank Select
180h
1FFh
0x20
FSR
INDF
FSR
FSR,4
NEXT
7
Indirect Addressing
INDIRECT ADDRESSING
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done?
;no clear next
;yes continue
© 2005 Microchip Technology Inc.
File Select Register
Location Select
0