Microchip Technology IC MCU OTP 2KX PIC17C42A-16/P DIP-40 MCP PIC17C42A-16/P Data Sheet
Product codes
PIC17C42A-16/P
PIC17C4X
DS30412C-page 40
1996 Microchip Technology Inc.
6.4.1
INDIRECT ADDRESSING REGISTERS
The PIC17C4X has four registers for indirect address-
ing. These registers are:
ing. These registers are:
• INDF0 and FSR0
• INDF1 and FSR1
• INDF1 and FSR1
Registers INDF0 and INDF1 are not physically imple-
mented. Reading or writing to these registers activates
indirect addressing, with the value in the correspond-
ing FSR register being the address of the data. The
FSR is an 8-bit register and allows addressing any-
where in the 256-byte data memory address range.
For banked memory, the bank of memory accessed is
specified by the value in the BSR.
mented. Reading or writing to these registers activates
indirect addressing, with the value in the correspond-
ing FSR register being the address of the data. The
FSR is an 8-bit register and allows addressing any-
where in the 256-byte data memory address range.
For banked memory, the bank of memory accessed is
specified by the value in the BSR.
If file INDF0 (or INDF1) itself is read indirectly via an
FSR, all '0's are read (Zero bit is set). Similarly, if
INDF0 (or INDF1) is written to indirectly, the operation
will be equivalent to a NOP, and the status bits are not
affected.
FSR, all '0's are read (Zero bit is set). Similarly, if
INDF0 (or INDF1) is written to indirectly, the operation
will be equivalent to a NOP, and the status bits are not
affected.
6.4.2
INDIRECT ADDRESSING OPERATION
The indirect addressing capability has been enhanced
over that of the PIC16CXX family. There are two con-
trol bits associated with each FSR register. These two
bits configure the FSR register to:
over that of the PIC16CXX family. There are two con-
trol bits associated with each FSR register. These two
bits configure the FSR register to:
• Auto-decrement the value (address) in the FSR
after an indirect access
• Auto-increment the value (address) in the FSR
after an indirect access
• No change to the value (address) in the FSR after
an indirect access
These control bits are located in the ALUSTA register.
The FSR1 register is controlled by the FS3:FS2 bits
and FSR0 is controlled by the FS1:FS0 bits.
The FSR1 register is controlled by the FS3:FS2 bits
and FSR0 is controlled by the FS1:FS0 bits.
When using the auto-increment or auto-decrement
features, the effect on the FSR is not reflected in the
ALUSTA register. For example, if the indirect address
causes the FSR to equal '0', the Z bit will not be set.
features, the effect on the FSR is not reflected in the
ALUSTA register. For example, if the indirect address
causes the FSR to equal '0', the Z bit will not be set.
If the FSR register contains a value of 0h, an indirect
read will read 0h (Zero bit is set) while an indirect write
will be equivalent to a NOP (status bits are not
affected).
read will read 0h (Zero bit is set) while an indirect write
will be equivalent to a NOP (status bits are not
affected).
Indirect addressing allows single cycle data transfers
within the entire data space. This is possible with the
use of the
within the entire data space. This is possible with the
use of the
MOVPF
and
MOVFP
instructions, where either
'p' or 'f' is specified as INDF0 (or INDF1).
If the source or destination of the indirect address is in
banked memory, the location accessed will be deter-
mined by the value in the BSR.
banked memory, the location accessed will be deter-
mined by the value in the BSR.
A simple program to clear RAM from 20h - FFh is
shown in Example 6-1.
shown in Example 6-1.
EXAMPLE 6-1:
INDIRECT ADDRESSING
MOVLW 0x20 ;
MOVWF FSR0 ; FSR0 = 20h
BCF ALUSTA, FS1 ; Increment FSR
BSF ALUSTA, FS0 ; after access
BCF ALUSTA, C ; C = 0
MOVLW END_RAM + 1 ;
LP CLRF INDF0 ; Addr(FSR) = 0
CPFSEQ FSR0 ; FSR0 = END_RAM+1?
GOTO LP ; NO, clear next
: ; YES, All RAM is
: ; cleared
6.5
Table Pointer (TBLPTRL and
TBLPTRH)
TBLPTRH)
File registers TBLPTRL and TBLPTRH form a 16-bit
pointer to address the 64K program memory space.
The table pointer is used by instructions
pointer to address the 64K program memory space.
The table pointer is used by instructions
TABLWT
and
TABLRD
.
The
TABLRD
and the
TABLWT
instructions allow trans-
fer of data between program and data space. The table
pointer serves as the 16-bit address of the data word
within the program memory. For a more complete
description of these registers and the operation of Table
Reads and Table Writes, see Section 7.0.
pointer serves as the 16-bit address of the data word
within the program memory. For a more complete
description of these registers and the operation of Table
Reads and Table Writes, see Section 7.0.
6.6
Table Latch (TBLATH, TBLATL)
The table latch (TBLAT) is a 16-bit register, with
TBLATH and TBLATL referring to the high and low
bytes of the register. It is not mapped into data or pro-
gram memory. The table latch is used as a temporary
holding latch during data transfer between program and
data memory (see descriptions of instructions
TBLATH and TBLATL referring to the high and low
bytes of the register. It is not mapped into data or pro-
gram memory. The table latch is used as a temporary
holding latch during data transfer between program and
data memory (see descriptions of instructions
TABLRD
,
TABLWT
,
TLRD
and
TLWT
). For a more complete
description of these registers and the operation of Table
Reads and Table Writes, see Section 7.0.
Reads and Table Writes, see Section 7.0.