sh66p51 SinoWealth Micro-Electronics Corp. Ltd, sh66p51 Datasheet - Page 14

• Manufacturer Part Number: sh66p51
• Description: Otp 2k 4-bit Micro-controller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

5.4. OSCX Oscillation
The OSCX is an internal 4MHz RC or external ceramic/crystal oscillator. The software options select the ceramic or internal
RC as the CPU's clock.
(1) OSCX Crystal Oscillator
(2) OSCX Ceramic Resonator
(3) OSCX internal RC Oscillator
When the internal 4MHz RC is selected, the OSCXI pin and OSCXO pin is also set as PORTE.0, PORTE.1.
5.5. Control of Oscillator
The oscillator control register configuration is shown as blow.
OXON: OSCX oscillation on/off.
OXM: switching system clock.
OXS: OSCX oscillator type selection
Address
$14
0: Turn-off OSCX oscillation
0: select OSC as system clock
0: OSCX set as ceramic oscillator
Internal 4MHz RC
OXS
Bit3
OSCXO
OSCXO
OSCXI
OSCXI
OSCXI
Bit2
-
Crystal
Ceramic
1: Turn-on OSCX oscillation
1: select OSCX as system clock
1: OSCX set as RC oscillator, and set OSCXI/OSCXO as PORTE
C1
C2
C1
C2
12pF (for reference only)
12pF (for reference only)
15pF (for reference only)
15pF (for reference only)
14
OXM
Bit1
OXON
Bit0
R/W
R/W
SH66P51