參數(shù)資料
型號: UPD753036
廠商: NEC Corp.
元件分類: 4位微控制器
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述: 4位單片機的小型通用紅外遙控器
文件頁數(shù): 23/88頁
文件大?。?/td> 373K
代理商: UPD753036
23
μ
PD753036, 753036(A)
Data Sheet U11353EJ4V0DS00
Remarks 1.
f
X
= Main system clock frequency
f
XT
= Subsystem clock frequency
Φ
= CPU clock
PCC: Processor Clock Control Register
SCC: System Clock Control Register
One Clock cycle (t
CY
) of the CPU clock equal to one machine cycle of the instruction.
2.
3.
4.
5.
6.
6.3 Subsystem Clock Oscillator Control Functions
The
μ
PD753036 subsystem clock oscillator has the following two control functions.
Selects by software whether an on-chip feedback resistor is to be used or not
Note
.
Reduces current consumption by decreasing the drive current of the on-chip inverter when the supply voltage
is high (V
DD
2.7 V).
Note
When the subsystem clock is not used, set SOS.0 to 1 (so as not to use the internal feedback resistor),
connect the XT1 pin to V
SS
, and open the XT2 pin to lower the supply current that is consumed in
the subsystem clock oscillator.
The above functions can be used by switching the bits 0 and 1 of the sub-oscillator control register (SOS). (Refer
to
Figure 6-2
.)
Figure 6-2. Subsystem Clock Oscillator
Feedback resistor
SOS.0
SOS.1
XT1
XT2
Inverter
V
DD
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