參數(shù)資料
型號: S1C63406F
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP128
封裝: PLASTIC, TQFP15-128
文件頁數(shù): 67/144頁
文件大小: 1160K
代理商: S1C63406F
S1C63406 TECHNICAL MANUAL
EPSON
21
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
4.3 Oscillation Circuit
4.3.1 Configuration of oscillation circuit
The S1C63406 has two oscillation circuits (OSC1 and OSC3). OSC1 is either a crystal or CR oscillation
circuit that supplies the operating clock to the CPU and peripheral circuits. OSC3 is a CR, crystal or
ceramic oscillation circuit. When processing with the S1C63406 requires high-speed operation, the CPU
operating clock can be switched from OSC1 to OSC3 by the software. To stabilize operation of the internal
circuits, the operating voltage VD1 must be switched according to the oscillation circuit to be used. Figure
4.3.1.1 is the block diagram of this oscillation system.
Oscillation circuit control signal
CPU clock selection signal
To CPU
To peripheral circuits
Clock
switch
Oscillation system
voltage regulator
OSC3
oscillation circuit
OSC1
oscillation circuit
Operating voltage selection signal
VD1
VOSC
Divider
Fig. 4.3.1.1 Oscillation system block diagram
Note: The S1C63406 supports the SLEEP function. The OSC3 oscillation circuit stops in the SLEEP
mode. The OSC1 oscillation circuit stops clock supply to the divider and peripheral circuits,
however, the oscillation continues. To prevent improper operation after the CPU wakes up, be sure
to run the CPU with the OSC1 clock before setting the CPU in the SLEEP mode.
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