High-Speed Clock Generator Circuit - Oki ML63611 User Manual

5.4

High-Speed Clock Generator Circuit

The high-speed clock generator circuit has two modes, the RC oscillation mode and ceramic oscillation mode. In
the OPTION A and OPTION B, only the RC oscillation mode is available. Oscillation modes are set by OSCSEL
(bit 2 of FCON). The oscillation frequency is a maximum of 200 kHz for the OPTION A and OPTION B, and a
maximum of 700 kHz for the OPTION C and OPTION D.
•
OSCSEL = "0" : RC oscillation mode
•
OSCSEL = "1" : ceramic oscillation mode
If the high-speed clock is not to be used, leave the OSC0 and OSC1 pins open (unconnected).
For the RC oscillation mode, attach an external resistor, R
For the ceramic oscillation mode, attach an external ceramic unit and capacitors as shown in Figure 5-3(b).
C
C
V
SS
Figure 5-3 External Circuits for High-Speed Clock Oscillation
!
Notes:
In the OPTION A and OPTION B, only the RC oscillation mode is available.
The high-speed clock frequency of the OPTION A and OPTION B is a maximum of 200 kHz.
The high-speed clock frequency of the OPTION C and OPTION D is a maximum of 700 kHz.
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
OSC1
V
DD
R
OSH
OSC0
(a) External Circuit for RC Oscillation Mode
Ceramic resonator
OSC1
L1
V
DD
L0
OSC0
(b) External Circuit for Ceramic Oscillation Mode
Chapter 5 Clock Generator Circuit (OSC)
, as shown in Figure 5-3(a).
OSH
C
V
OS
DD
V
DD
Oscillation enable
5 – 3
OPTION B (D): 1.5 V (3.0 V), With regulator
ML63611 User's Manual
Oscillation
enable
High-speed
clock output
High-speed
clock output
circuit for LCD bias