參數(shù)資料
型號： HD404668
廠商： Hitachi,Ltd.
英文描述： Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī))
中文描述： 低電壓如同在微機(jī)芯片的DTMF產(chǎn)生電路（帶雙音多頻電路的低電壓微計算機(jī)）
文件頁數(shù)： 37/142頁
文件大?。?/td> 894K
代理商： HD404668
HD404669 Series
37
Subactive Mode:
The OSC
1
and OSC
2
oscillator stops and the MCU operates with a clock generated by
the X1 and X2 oscillator. In this mode, functions other than the DTMF generation circuit operate, but since
the operating clocks are slow, power consumption is the lowest after watch mode.
The CPU instruction execution speed can be selected as 244
μ
s or 122
μ
s by setting bit 2 (SSR12) of the
system clock select register (SSR1: $029). Note that the SSR12 value must be changed in active mode. If
the value is changed in subactive mode, the MCU may malfunction.
When the STOP or SBY instruction is executed in subactive mode, the MCU enters either watch or active
mode, depending on the statuses of the low speed on flag (LSON: $020, bit 0) and the direct transfer on
flag (DTON: $020, bit 3).
Subactive mode is an optional function that the user must specify on the function option list.
Interrupt Frame:
In watch and subactive modes,
φ
CLK
is applied to timer A and the
INT
0
I
circuit.
Prescaler W and timer A operate as the time-base and generate the timing clock for the interrupt frame.
Three interrupt frame periods (T) can be selected by setting the miscellaneous register (MIS: $00C) (figure
18).
In watch and subactive modes, the timer-A/
INT
0
interrupt is generated synchronously with the interrupt
frame. The interrupt request is generated synchronously with the interrupt strobe timing except during
transition to active mode. An overflow and interrupt request in timer A is generated synchronously with the
interrupt strobe timing.
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
0
0
W
MIS0
1
0
W
MIS1
Miscellaneous register (MIS: $00C)
MIS1
0
MIS0
T
*
0
0.24414 ms
t
RC
0.12207 ms
0.24414 ms
7.8125 ms
31.25 ms
Oscillation circuit conditions
External clock input
Ceramic oscillator
Crystal oscillator
0
1
1
1
0
1
15.625 ms
62.5 ms
Not used
Not used
—
Notes: 1.
2.
Values of T and t
RC
when a 32.768-kHz crystal oscillator is used to pins x1 and x2.
The value is applied only when direct transfer operation is used.
Buffer control.
See figure 37 in the
pull-up and pull-down
MOS transistor
control section
MIS3
MIS2
1
*
1
*
2
Figure 18 Miscellaneous Register (MIS)
相關(guān)PDF資料
PDF描述
HD404669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī))
HD407A4669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機(jī))
HD404719FS Five timer/counters
HD404439FS Five timer/counters
HD4074719FS Five timer/counters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404668H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD404669SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404676H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
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