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HT56R67 Datasheet(PDF) 23 Page - Holtek Semiconductor Inc

Part # HT56R67
Description  TinyPower A/D Type with LCD 8-Bit OTP MCU
Download  129 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56R67 Datasheet(HTML) 23 Page - Holtek Semiconductor Inc

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HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688
Rev. 1.70
2014-04-04
23
查表范例
以下范例说明在 HT56R678 中,表格指针和表格数据如何被定义和执行。这个例子使用的表格
数据用 ORG 伪指令储存在存储器的最后一页。HT56R678 中,ORG 指令“7F00H”指向的地址是
32K 程序存储器中最后一页的起始地址。表格指针的初始值设为 06H,这可保证从数据表格读取的
第一笔数据位于程序存储器地址 7F06H,即最后一页起始地址后的第六个地址。值得注意的是,假
如“TABRDC [m]”指令被使用,则表格指针指向当前页。在这个例子中,表格数据的高字节等于零,
而当“TABRDL [m]”指令被执行时,此值将会自动的被传送到 TBLH 寄存器。
tempreg1
db ?
; temporary register #1
tempreg2
db ?
; temporary register #2
mov
a,06h
; initialize table pointer – note that this address
; is referenced
mov
tblp,a
; to the last page or present page
tabrdl tempreg1
; transfers value in table referenced by table pointer
; to tempreg1 data at prog。 memory address 7F06H transferred to
; tempreg1 and TBLH
dec
tblp
; reduce value of table pointer by one
tabrdl tempreg2
; transfers value in table referenced by table pointer
; to tempreg2
; data at prog. memory address 7F05H transferred to
; tempreg2 and TBLH
;in this example the data 1A is transferred to
;to tempreg1 and data
0F to register tempreg2
; the value _00H_ will be transferred to the high byte
; register TBLH
org
7F00h
; sets initial address of last page
dc
00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
TBLH 寄存器为只读寄存器,不能重新储存,若主程序和中断服务程序都使用表格读取指令,
应该注意它的保护。使用表格读取指令,中断服务程序可能会改变 TBLH 的值,若随后在主程序中
再次使用这个值,则会发生错误,因此建议避免同时使用表格读取指令。然而在某些情况下,如果
同时使用表格读取指令是不可避免的,则在执行任何主程序的表格读取指令前,中断应该先除能,
另外要注意的是所有与表格相关的指令,都需要两个指令周期去完成操作。


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