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UPD17062 데이터시트(PDF) 247 Page - Renesas Technology Corp

부품명 UPD17062
상세설명  MOS INTEGRATED CIRCUIT
PDF  298 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17062 데이터시트(HTML) 247 Page - Renesas Technology Corp

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245
µPD17062
b3
b2
b1
b0
0
0
IDCEN
0
1
0
Turns off the display.
Turns on the display.
(RF 31H)
20.3
IDC ENABLE FLAG
The IDCEN (IDC enable) flag is manipulated to start IDC operations (turn on the display). The flag is mapped
at the lowest bit (#0) of the register file at 31H.
Table 20-2
IDCEN Flag
(1) Cautions in turning on the display
(a) The IDCEN flag must be set to 1 (begin displaying), when the vertical sync signal (Vsync) is high
(vertical flyback time: Vsync = low level) after the IDCDMAEN flag (RF, at 00H, #1) is turned on.
(b) Do not write data to VRAM, when the IDCEN flag is 1 (display turned on).
Sample program
SET1
IDCDMAEN
; Sets the DMA mode.
CLR1
IDCEN
; If the display is on when VRAM data is to be specified,
; reset the IDCEN (turn off the display).
Sets data in VRAM.
; Sets VRAM data.
LOOP
SKF1
INTVSYN
; Makes sure Vsync = low level, and sets the IDCEN.
BR
LOOP
SET1
IDCEN
; Turns on the display.



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