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| 型号： | M38037M6H-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PDIP64 |
| 封装： | 0.750 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-64 |
| 文件页数： | 28/119页 |
| 文件大小： | 1818K |
| 代理商： | M38037M6H-XXXSP |
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Rev.3.11
Apr 5, 2006
Page 14 of 113
REJ03B0017-0311
3803 Group (Spec.H)
MISRG
(1) Bit 0 of address 001016: Oscillation stabilizing time
set after STP instruction released bit
When the MCU stops the clock oscillation by the STP instruction
and the STP instruction has been released by an external
interrupt source, usually, the fixed values of Timer 1 and
Prescaler 12 (Timer 1 = 0116, Prescaler 12 = FF16) are
automatically reloaded in order for the oscillation to stabilize.
The user can inhibit the automatic setting by setting “1” to bit 0
of MISRG (address 001016).
However, by setting this bit to “1”, the previous values, set just
before the STP instruction was executed, will remain in Timer 1
and Prescaler 12. Therefore, you will need to set an appropriate
value to each register, in accordance with the oscillation
stabilizing time, before executing the STP instruction.
Figure.10 shows the structure of MISRG.
(2) Bits 1, 2, 3 of address 001016: Middle-speed Mode
Automatic Switch Function
In order to switch the clock mode of an MCU which has a sub-
clock, the following procedure is necessary:
set CPU mode register (003B16) --> start main clock oscillation
--> wait for oscillation stabilization --> switch to middle-speed
mode (or high-speed mode).
However, the 3803 group (Spec.H) has the built-in function
which automatically switches from low to middle-speed mode by
program.
Middle-speed mode automatic switch by program
The middle-speed mode can also be automatically switched by
program while operating in low-speed mode. By setting the
middle-speed automatic switch start bit (bit 3) of MISRG
(address 001016) to “1” in the condition that the middle-speed
mode automatic switch set bit is “1” while operating in low-
speed mode, the MCU will automatically switch to middle-speed
mode. In this case, the oscillation stabilizing time of the main
clock can be selected by the middle-speed automatic switch wait
time set bit (bit 2) of MISRG (address 001016).
Fig 10. Structure of MISRG
MISRG
(MISRG: address 001016)
b7
b0
Oscillation stabilizing time set after STP instruction
released bit
0 : Automatically set “0116” to Timer 1, “FF16” to
Prescaler 12
1 : Automatically set disabled
Middle-speed mode automatic switch set bit
0 : Not set automatically
1 : Automatic switching enabled(1)
Middle-speed mode automatic switch wait time set bit
0 : 4.5 to 5.5 machine cycles
1 : 6.5 to 7.5 machine cycles
Middle-speed mode automatic switch start bit
(Depending on program)
0 : Invalid
1 : Automatic switch start(1)
Not used (return “0” when read)
(Do not write “1” to this bit)
Note 1 : When automatic switch to middle-speed mode from low-speed mode occurs,
the values of CPU mode register (3B16) change.
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