Low-Speed Clock Generator Circuit - Oki ML63611 User Manual

ML63611 User's Manual
Chapter 5 Clock Generator Circuit (OSC)
5.3

Low-Speed Clock Generator Circuit

The low-speed clock generator circuit is configured using a crystal oscillator circuit. A crystal unit (32.768 kHz) is
connected between the pins XT0 and XT1, and a capacitor (5 to 25 pF) is connected between the pins XT0 and
V . The output (TBCCLK) of the low-speed clock generator circuit becomes the basic operating clock for the
SS
time base counter etc., and is used as the system clock.
For the crystal oscillation mode, attach an external crystal unit and a capacitor (C
Crystal
Figure 5-2 External Circuit for Low-Speed Clock Oscillation
!
Note:
The crystal and the capacitor C
Table 5-1 shows an example external component to be attached when the low-speed side crystal oscillation mode
is selected.
Table 5-1 Example External Component for the Low-Speed Side Crystal Oscillation Mode
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
C
G
V
SS
XT0
R
f
C
XT1
D
V Inside the IC
SS
External Circuit for Crystal Oscillation Mode
should be connected in close proximity to the XT0 and XT1 pins.
G
C f
G XT
12 pF 32.768 kHz
V
XT
Model name/Manufacturer
VT-150, VT-200/SII
5 – 2
OPTION B (D): 1.5 V (3.0 V), With regulator
) as shown in Figure 5-2.
G
Low-speed clock
output
(TBCCLK)
circuit for LCD bias