sh6614d SinoWealth Micro-Electronics Corp. Ltd, sh6614d Datasheet - Page 8

• Manufacturer Part Number: sh6614d
• Description: 4k 4-bit Microcontroller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

4. Data memory
The general purpose data memory is organized as 512 * 4 bits. Because of its static feature, the RAM can retain data after the
CPU enters STOP or HALT mode.
5. Oscillator circuit
5.1. Circuit Configuration
SH6614D has two on-chip oscillation circuits OSC and OSCX.
OSC is a low frequency crystal (Typ. 32.768KHz) or RC (Typ.262KHz) determined by the code option. This is designed for low
frequency operation. OSCX also has two types: ceramic (Typ.455KHz) or RC (1.8M or 2MHz) to be determined by the software
option. It is designed for high frequency operation.
It is possible to select the high speed CPU processing by a high frequency clock and select low power operation by low
operation clock. At the start of reset initialization, the OSC starts oscillation and OSCX is turned off. Immediatly after reset
initialization, the OSC clock is automatically selected as the system clock input source.
Oscillator Block Diagram
Timing of System Clock Switching
OSCXO
OSCXI
OSCI
OSCO
Low Frequency
Clock Oscillator
Clock Oscillator
High Frequency
8
& Switching control
Source Selector
System clock
System clock
Generator
Base Timer
Clock
CPU
SH6614D