SN8P2318 Series
C-type LCD, RFC 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 48
Version 1.5
Note: Connect the Crystal/Ceramic and C as near as possible to the XIN/XOUT/VSS pins of
micro-controller. Connect the R and C as near as possible to the VDD pin of micro-controller.
4.4 SYSTEM LOW-SPEED CLOCK
The external low-speed oscillator includes 32KHz and RC type controlled by
“Low_Clk” code option. The 32KHz
oscillator supports crystal and ceramic types connected to LXIN/LXOUT pins with 10pF capacitors to ground. The RC
type is a low cost RC structure, builds in R (resistor), and connects external C (capacitor) with LXIN pin. The
capacitance is 27pF @3V and 39pF @5V at 32KHz. LXOUT pin outputs Flosc = 32KHz signal for adjust the
capacitance by RC type.
32K X
’tal:
The system low-speed clock source is external low-speed 32768Hz crystal.
RC:
The system low-speed clock source is external low cost RC type oscillator. The RC oscillator circuit only
connects one capacitor to LXIN pin, and the LXOUT pin outputs 32KHz signal.
EXTERNAL OSCILLATOR APPLICATION CIRCUIT
32KHz CRYSTAL/CERAMIC:
RC Type:
MCU
VCC
GND
C
10pF
LXIN
LXOUT
VDD
V
S
S
C
10pF
32768Hz
MCU
VCC
GND
LXIN
LXOUT
VDD
VSS
C
27pF (3V)
39pF (5V)
Note: Connect the Crystal/Ceramic and C as near as possible to the LXIN/LXOUT/VSS pins of
micro-controller. Connect the C as near as possible to the VSS pin of micro-controller.