TMP86C820UG Datasheet, PDF (139/160 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP86C820UG
13.4 Control Method of LCD Driver
13.4.1 Initial setting
Figure 13-5 shows the flowchart of initialization.
Example : To operate a 1/4 duty LCD of 32 segments × 4 com-mons at frame frequency fc/2¹⁶ [Hz], and booster fre-
quency fc/2¹³ [Hz]
LD
(LCDCR), 01000001B
; Sets LCD driving method and frame frequency. Boost frequency
LD
(P*LCR), 0FFH
; Sets segment output control register. (*; Port No.)
:
:
:
:
; Sets the initial value of display data.
LD
(LCDCR), 11000001B
; Display enable
Sets LCD driving method (DUTY).
Sets boost frequency (VFSEL).
Sets frame frequency (SLF).
Enables booster circuit (BRES)
Sets segment output control registers
(P*LCR (*; Port No.))
Initialization of display data area.
Display enable (EDSP)
(Releases from blanking.)
Figure 13-5 Initial Setting of LCD Driver
13.4.2 Store of display data
Generally, display data are prepared as fixed data in program memory (ROM) and stored in display data area
by load command.
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