參數(shù)資料
型號(hào)： 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(yè)數(shù)： 36/107頁(yè)
文件大?。?/td> 788K
代理商： S1C6S460D
26
EPSON
S1C6S460 TECHNICAL MANUAL
CHAPTER 5: OSCILLATION CIRCUIT
5.6 Control of Oscillation Circuit
The control registers for the oscillation circuit are explained below.
Table 5.6.1 Control registers of oscillation circuit
Address
Comment
Register
D3
D2
D1
D0
Name
Init
1
0
F70H
VSC0
CLKCHG
OSCC
VSC1
VSC0
0
CPU system clock switch
OSC3 oscillation On/Off
OSC3
On
VSC1
OSCC
CLKCHG
CPU operating voltage switch
OSC1
Off
R/W
VSC0 and VSC1 (F70H [D0 and D1], R/W)
Switches the operating voltage of the internal circuit in accordance to the oscillation frequency and power
source voltage.
The corresponding setting description is shown in Table 5.6.2.
Table 5.6.2 Corresponding between oscillation frequency, power source voltage, and operating voltage (VS1)
VSC1 VSC0
VS1
Oscillation circuit
Oscillation frequency
Power source voltage (VDD–VSS)
0
-1.2 V
OSC1
32.768 kHz
Under 3.1 V
0
1
-2.1 V
OSC1
32.768 kHz
3.1 V or more (
)
0
1
-2.1 V
OSC3
1 MHz
2.2 V or more
1
×
-3.0 V
OSC3
2 MHz
3.1 V or more
The VDD reference voltage is used as the operating voltage VS1.
There is no need to set the (
) state with regards to power whose initial value is 3.6 V or less as in lithium
batteries.
VSC1 and VSC0 are set to "0" at initial reset.
Note: When switching VS1 from -1.2 V (for OSC1 crystal oscillation circuit) to -3.0 V (for OSC3 oscillation
circuit), or vice versa, be sure to hold the -2.1 V setting for more than 5 ms first for power voltage
stabilization.
(VSC1, VSC0) = (0, 0)
→ (0, 1) → 5 ms WAIT → (1, ×)
= (1,
×) → (0, 1) → 5 ms WAIT → (0, 0)
= (0, 0)
→ (1, ×) is prohibited
= (1,
×) → (0, 0) is prohibited
Furthermore, perform the switch after making sure that power voltage by SVD is more than the VS1
(absolute value) set voltage. Switching VS1 when the power source voltage is lower than the set
voltage may cause malfunction.
OSCC (F70H [D2], R/W)
Controls the oscillation of the OSC3 oscillation circuit.
When "1" is written: OSC3 oscillation ON
When "0" is written: OSC3 oscillation OFF
Reading: Valid
When high-speed operation of the CPU is required, OSCC is set to "1"; otherwise, set it to "0" to minimize
power current consumption.
At initial reset, OSCC is set to "0".
Note: It takes 5 ms for the OSC3 oscillation circuit to stabilize after oscillation turns ON. Since oscillation
stabilization time differs according to external oscillation terminal and usage conditions, set the
stand-by time with enough allowance when switching the clock frequency.
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