參數(shù)資料
型號(hào): KSZ8864RMN-EVAL
廠商: Micrel Inc
文件頁(yè)數(shù): 36/111頁(yè)
文件大?。?/td> 0K
描述: BOARD EVALUATION FOR KSZ8864RMN
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,以太網(wǎng)控制器(PHY 和 MAC)
嵌入式:
已用 IC / 零件: KSZ8864RMN
已供物品:
相關(guān)產(chǎn)品: 576-3787-ND - IC ETHERNET SW 4PORT 64QFN
其它名稱: 576-3869
PIC16C9XX
DS30444E - page 30
1997 Microchip Technology Inc.
Example 4-1 shows the calling of a subroutine in
page 1 of the program memory. This example assumes
that PCLATH is saved and restored by the interrupt ser-
vice routine (if interrupts are used).
EXAMPLE 4-1:
CALL OF A SUBROUTINE IN
PAGE 1 FROM PAGE 0
ORG 0x500
BSF
PCLATH,3
;Select page 1 (800h-FFFh)
CALL
SUB1_P1
;Call subroutine in
:
;page 1 (800h-FFFh)
:
ORG 0x900
SUB1_P1:
;called subroutine
:
;page 1 (800h-FFFh)
:
RETURN
;return to Call subroutine
;in page 0 (000h-7FFh)
4.5
Indirect Addressing, INDF and FSR
Registers
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 produce 00h. Writing to the INDF regis-
ter 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 4-10.
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 4-2.
EXAMPLE 4-2:
INDIRECT ADDRESSING
movlw
0x20
;initialize pointer
movwf
FSR
;to RAM
NEXT
clrf
INDF
;clear INDF register
incf
FSR,F
;inc pointer
btfss
FSR,4
;all done?
goto
NEXT
;no clear next
CONTINUE
:
;yes continue
FIGURE 4-10: DIRECT/INDIRECT ADDRESSING
For memory map detail see Figure 4-2.
Data
Memory
Indirect Addressing
Direct Addressing
bank select
location select
RP1:RP0
6
0
from opcode
IRP
FSR register
7
0
bank select
location select
00
01
10
11
00h
7Fh
00h
7Fh
Bank 0
Bank 1
Bank 2
Bank 3
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