HE84760 Datasheet, PDF (30/31 Pages) King blillion Electronics Co.,Ltd. – 8-bit Micro-controller

King Billion Electronics Co., Ltd
駿億電子股份有限公司
HE84760
HE80000 SERIES
22. Important Note
1. Please note that ICE is different from IC. ICE is the super set of HE80000 series IC, but each IC is a
subset of ICE. Never use any hardware resource that real IC doesn't have, especially RAM and
register. KBIDS and compiler cannot prevent user to use some hardware resource that didn't exist.
2. Please use ICE5.x (Type-III LCD Driver) to emulate the equivalent effect of Type-IV LCD driver.
The same bias and LV5 will get almost the same result of display effect. Adjust your bias and LVL5
on ICE 5.x and make sure the display of LCD is OK. Then the display effect of 84760 (Type-IV
LCD driver) will be the same at the same bias and LV5.
3. When 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 this accessing
process on ICE. So 5us delay should be added by firmware.
4. LCD driving circuit must be turned off before IC goes into sleep mode.
5. Please bond the TSTP_P, RSTP_N and PRTD[7:0] with test points on PCB, which can be soldered
and probed, and 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.
6. LV5 must be lower than 8.5 Volt. Otherwise IC may breakdown.
7. The voltage adjustment mechanism shall be reserved for LV2 voltage fine-tunes; since it’s possible
there is some variation in LV2 voltage due to IC manufacture process variation. User can use
variable-resistor to adjust the LV2 voltage or use some tools to detect the LV2 and then select a
proper resistor. Please refer to application note AN025 for the detailed description.
8. Users must call the library “swap_page” in the file swappage.asm of application note AN029. The
real IC register is different from ICE4.x or ICE5.x. This subroutine makes sure that users can run on
both real IC and ICE for page swapping. The program of swappage.asm as following:
.area swapping_variable(data)
_mapreg1::
.ds 1 ;store page register(R1Bh)
mapreg2::
.ds 1 ;store page register(R1Ch)
.area swappingpage(code,pag0)
;======================================================
;swap page function
;======================================================
swappage::
lda #10h
sta mapreg1
lda #00h
; P1EO[2] <--0 to enable Port R1Fh
sta riceco
; RICECO is write only
August 15, 2003
Page 30 of 31
V1.2
This specification is subject to change without notice. Please contact sales person for the latest version before use.