ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 59

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RAiO
6-6
TECHNOLOGY INC.
EXT Φ0
RA8806 supports internal or external clock source without extra select pin.
6-6-1 OSC Circuit
6-6-2 External Clock
Signal
Clock and Reset
RA8806 contains a built-in OSC circuits. It generates corresponding clock by connecting an external
4M ~ 12MHz crystal between XG and XD pins. Figure 6-25 is the clock circuit for X’tal oscillator and
external clock.
RA8806 can also accept external clock for system clock source. The external clock source can
directly connect to XG pin, and XD pin must be kept floating.
Notes:
EXT￠0
Symbol
1.
2.
t
t
t
t
RCL
FCL
WH
WL
t
t (
t (
C
C
C
−
−
15pF
15pF
t
t
RCL
RCL
External clock rise time
External clock fall time
External clock
HIGH-level pulse width
External clock
LOW-level pulse width
External clock period
(4~12MHz)
−
−
X’tal
t
t
FCL
FCL
Parameter
)
)
×
×
XG
XD
1000
1000
475
525
Figure 6-26 : External Clock
RA8806
Table 6-18 : Clock Timing
Figure 6-25: Clock Circuit
<
>
t
t
WH
WH
t ,
t ,
WL
WL
t
WL
59/184
Note 1. Note 2. Note 1. Note 2.
Note 1. Note 2. Note 1. Note 2.
Min.
66.6
—
—
V
DD
Two Layers Character/Graphic LCD Controller
(4~12MHz)
t
C
= 5V
CLK
Max.
10
10
—
t
RCL
t
WH
Min.
83.3
—
—
V
DD
XG
XD
= 3.3V
RA8806
Max.
t
FCL
10
10
—
Unit
ns
ns
ns
ns
ns
www.raio.com.tw
Ta = –20 to 75℃
Condition
RA8806