HT37B90/HT37B70/HT37B50/HT37B30
Table Location Bits
Instruction
b18~b13
TABRDC [m] TBHP1_2~TBMP1_5 TBMP1_4~TBMP1_0 @7
TABRDL [m] BP1_5~BP1_0 11111 @7
b12~b8
b7
b6
@6
@6
b5
@5
@5
b4
@4
@4
b3
@3
@3
b2
@2
@2
b1
@1
@1
b0
@0
@0
Table Location
Note: @7~@0: Table pointer lower-order bits are TBLP1 [7:0]
b17~b0: Current program ROM table address A [18:0]
TBMP1_4~TBMP1_0: TBMP1 bit 4 ~0
TBHP1_2~TBMP1_5: TBHP1 (bit 2 ~0) to TBMP1 (bit7 ~5)
BP1_5 ~BP1_0: Bits of bank BP1 bit0~5
For the HT37B90, the Table address location is 19 bits wide, i.e. from b18~b0.
For the HT37B70, the Table address location is 18 bits wide, i.e. from b17~b0.
For the HT37B50, the Table address location is 17 bits wide, i.e. from b16~b0.
For the HT37B30, the Table address location is 16 bits wide, i.e. from b15~b0.
tempreg1 db
tempreg2 db
tempreg3 db
tempreg4 db
?
?
?
?
; temporary register #1
; temporary register #2
; temporary register #3
; temporary register #4
:
:
mov a,01h
; set ROM bank 1 point
mov bp1,a
mov a,06h
mov tblp1,a
clr tbmpl
clr tbhpl
; initialise table pointer
; to the last page
:
:
tabrdl
tempreg1
tempreg2
; transfers value in table referenced by table pointer
; to tempregl
; data at prog. memory address ²3F06H² transferred to
; tempreg1 and TBLH
dec tblp1
tabrdl
; reduce value of table pointer by one
; transfers value in table referenced by table pointer
; to tempreg2
; data at prog.memory address ²3F05H² transferred to
; tempreg2 and TBLH
; in this example the data ²1AH² is transferred to
; tempreg1 and data ²0FH² to register tempreg2
; the value ²00H² will be transferred to the high byte
; register TBLH
:
:
mov a,04h
mov tblp1,a
mov a,3Fh
; initialise table pointer low byte
;
; initialise table pointer middle byte
mov tbmp1,a
mov a,00h
; initialise table pointer high byte
;
mov tbhp1,a
tabrdc
tempreg3
:
:
rombank
1
romsumvalue1; sets rombank 1 initial address of last page
;(for HT37B90/70/50/30)
romsumvalue1 .section at 1F00h ¢code¢
dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
:
:
Rev. 1.00
13
June 22, 2017
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
