參數(shù)資料
型號: S1C6S460D
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124
封裝: 4.69 X 4.68 MM, DIE-124
文件頁數(shù): 37/107頁
文件大小: 788K
代理商: S1C6S460D
S1C6S460 TECHNICAL MANUAL
EPSON
27
CHAPTER 5: OSCILLATION CIRCUIT
CLKCHG (F70H [D3], R/W)
Selects the CPU operating clock.
When "1" is written: OSC3 clock is selected
When "0" is written: OSC1 clock is selected
Reading: Valid
When assigning OSC3 as the CPU operating clock, set CLKCHG to "1"; when assigning OSC1, set it to "0".
At initial reset, CLKCHG is set to "0".
Note: When switching the CPU operating clock from OSC1 to OSC3, follow the flow chart shown in
Figure 5.6.1 and then proceed with software processing.
V
CLK CHG
to -2.1 V
CLK CHG
OSC3
oscillation ON
5 ms WAIT
CLK
OSC1
→OSC3
OSC3>500 kHz
5 ms WAIT
CLK
OSC1
→OSC3
= -2.1 V, OSC3 = 1 MHz (stabilized)
= -3.0 V, OSC3 = 2 MHz (stabilized)
N
Y
S1
V
S1
Set V
S1
V
S1
V
OSC3
oscillation ON
= -1.2 V
to -3.0 V
S1
Set V
Condition:
DD
< -3.1 V
Condition:
– VSS
Fig. 5.6.1 CPU operating clock control flow
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