sh66l16a SinoWealth Micro-Electronics Corp. Ltd, sh66l16a Datasheet - Page 10

• Manufacturer Part Number: sh66l16a
• Description: 16k 4-bit Low Power Micro-controller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

5. System Clock and Oscillator
SH66L16A has two on-chip oscillation circuits OSC and OSCX.
The OSCX oscillator generates the basic clock pulses that provide the system clock to supply CPU and on-chip peripherals. If
the “ System Clock selection” code option is equal to CK = 0,0 (200kHz RC as system clock with 32.768kHz Crystal for the
Base Timer), or CK = 0,1 (200kHz RC as system clock with 32kHz RC for the Base Timer), or CK = 1,1 (200kHz RC as system
clock (The Base Timer clock source will be fetched from the system clock if it is used.), the system is sourced from the OSCX
oscillator.
System clock = f
The OSC oscillator generates the clock pulses that provide the Base Timer and the LCD driver. The OSC oscillator can be
controlled ON/OFF by the BTM bits setting in the system register $03. If the “ System Clock selection” code option is equal to
CK = 1,0 (32.768kHz Crystal as system clock (The Base Timer clock source will be fetched from the system clock if it is used.),
the system is sourced from the OSC oscillator.
System clock = f
5.1. Instruction Cycle Time
(1) 4/200kHz (= 20 µ s) for 200kHz RC oscillator.
(2) 4/32.768kHz (= 122 µ s) for 32.768kHz Crystal oscillator.
5.2. OSC Oscillator Type
(1) Crystal oscillator: 32.768kHz
5.3. OSCX Oscillator
RC oscillator: 200kHz
5.4. Capacitor Selection for Oscillator
Notes:
1. Capacitor values are used for design guidance only!
2. These capacitors were tested with the crystals listed above for basic start-up and operation. They are not optimized.
3. Be careful for the stray capacitance on PCB board, the user should test the performance of the oscillator over the expected
Before selecting crystal, the user should consult the crystal manufacturer for appropriate value of external component to get
best performance, visit
V
Frequency
32.768kHz
DD
and the temperature range for the application.
External R
OSCX
OSC
Crystal Oscillator
OSCX
/4
/4
OSCO
5 - 12.5pF
OSCXI
OSCI
http://www.sinowealth.com
RC
C1
1000pF (for reference only)
R
OSCX
5 - 12.5pF
Crystal
C2
C1
C2
V
DD
for more recommended manufactures.
Recommend Type
10
DT 38 ( φ 3x8)
(2) RC oscillator: 32kHz
External R
OSC
OSCI
RC
Manufacturer
1000pF (for reference only)
KDS
R
OSC
SH66L16A
V
DD