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| 型號： | HE847701 |
| 廠商： | King Billion Electronics Co., Ltd. |
| 英文描述： | 8-bit Micro-controller |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 28/29頁 |
| 文件大?。?/td> | 438K |
| 代理商： | HE847701 |
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King Billion Electronics Co., Ltd
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HE847701
HE80000 SERIES
21.
Important Note
March 26, 2004
This specification is subject to change without notice. Please contact sales person for the latest version before use.
Page 28 of 29
V1.03
1.
For accessing any address large than 64KB, users must update TPP first, TPH then TPL. Only by this
order, the pre-charge circuit of ROM will work correctly. 5us waiting is necessary before LDV
instruction is executed since Data ROM is a low speed ROM. Users can not emulate accessing delay
with ICE. So 5us delay should be added by firmware.
LCD driving circuit must be turned off before MCU goes into sleep mode.
Please bond the TSTP_P, RSTP_N and PRTD[7:0] with test points on PCB, which can be soldered
and probed. Connect TSTP_P pin with zero ohm resistor to GND (or copper wire which can be cut
easily on PCB) for good ESD protection. So that IC testing can be done on PCB, if necessary, by
removing the 0-ohm resistor and driving TSTP_P pin to high.
LV5 must small than 8.5 Volt. Otherwise IC may breakdown.
Users must call the library “swap_page” in the file swappage.asm of AN029. The real IC register is
different from ICE4.x or ICE5.x. This subroutine make sure that users can run on both real IC and
ICE for page swapping. The program of swappage.asm as following:
2.
3.
4.
5.
.area
swapping_variable(data)
_mapreg1:: .ds 1 ;store page register(R1Bh)
_mapreg2:: .ds 1 ;store page register(R1Ch)
.area
swapping_page(code,pag0)
;======================================================
;swap page function
;======================================================
swap_page::
lda #10h
sta _mapreg1
lda #00h
sta r_iceco
lda _mapreg2
sta r_iced
lda _mapreg2
anda #0fh
ora #20h
;
sta r1Ch
sta r_ps1
lda _mapreg2
; P1E_O[2] <--0 to enable Port R1Fh
; R_ICECO is write only
;Mapping _mapreg2 low nibble to Logical segment2
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