Hitachi AP1 Data Book page 181

------------------------------------------------------------------LCD-IV
8. Applied to external clock operation (system clockl.
Open OSC
2
9.
Applied to internal clock operation using resistor Rt. (system clockl
TI
Duty = - - - x 100%
Th
+
TI
Wiring of OSC I and OSC
2
terminals should be as short as possible because the oscillation frequency is modified by capaci-
tance of these terminals.
10. Applied to internal clock operation using ceramic filter. (system clockl
11. Power supply condition Vee
~
VI
~
V
2
~
Va
~
GND should be maintained. __ .
12. Applied to input pins, I/O common pins among 0 and R terminals, and RESET, HLT, ose, , INTo, INT, pans.
13. Lower limit of operation frequency is determined by liquid crystal display duty. Flutter occurs on liquid crystal display if
frame frequency is under 32 Hz. Therefore operation frequency should be determined to prevent that frame frequency
becomes under 32 Hz.
The following shows the relation between liquid crystal display frame frequency and operation frequency.
1,000
500
~
f
u..
i;'
Frame Frequency
~
Lower Limit
i5
00
50
1 0
10
/
. /
. / ./
/
/ /
;
V'
V
"'I/~
50
100
/
/
. /
Vv
/
S tatic
V'
V '
12
duty
/3 duty
4 duty
V
'
/
500
Operation Frequency f cp , f olc (kHzl
14. INTo and INTI inputs must be retained for two or more instruction cycle time at both "High" and "Low" levels.
15. Power supply circuit for LCD is excluded. The standby supply current (11 is the supply at Vee = 5V
±
10% in "Halt" state
in the case that the crystal oscillation for timer is not selected. The supply current when supply voltage falls to the Halt
Duration Voltage is called "Halt Current"
(lOHI.
(shown in ELECTRICAL CHARACTERISTlCS-21
179