參數(shù)資料
型號： M37545G8-XXXGP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32
封裝： 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32
文件頁數(shù)： 32/63頁
文件大小： 774K
代理商： M37545G8-XXXGP
Rev.1.07
Mar 19, 2009
Page 38 of 60
REJ03B0140-0107
7545 Group
CLOCK GENERATING CIRCUIT
An oscillation circuit can be formed by connecting a resonator
between XIN and XOUT.
Use the circuit constants in accordance with the resonator
manufacturer's recommended values.
No external resistor is needed between XIN and XOUT since a
feed-back resistor exists on-chip. (An external feed-back resistor
may be needed depending on conditions.)
<Ceramic resonator/quartz-crystal oscillator>
When the ceramic resonator/quartz-crystal oscillator is used for
the main clock, connect the ceramic resonator/quartz-crystal
oscillator and the external circuit to pins XIN and XOUT at the
shortest distance. A feedback resistor is built in between pins XIN
and XOUT. (An external feed-back resistor may be needed
depending on conditions.)
Oscillation Control
1. Stop mode
When the STP instruction is executed, the internal clock
φ stops
at an “H” level and the XIN oscillator stops. At this time, timer 1
is set to “0316” and prescaler 1 is set to “FF16”when the
oscillation stabilization time set bit after release of the STP
instruction is “0”. On the other hand, timer 1 and prescaler 1 are
not set when the above bit is “1”. Accordingly, set the wait time
fit for the oscillation stabilization time of the oscillator to be
used. When an external interrupt is accepted, oscillation is
restarted but the internal clock
φ remains at “H” until timer 1
underflows. As soon as timer 1 underflows, the internal clock
φ
is supplied. This is because when a ceramic resonator is used,
some time is required until a start of oscillation.
In the stop mode, the voltage drop detection circuit is stopped, so
that the power dissipation is reduced.
2. Wait mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level, but the oscillator does not stop. The internal clock
restarts if a reset occurs or when an interrupt is accepted. Since
the oscillator does not stop, normal operation can be started
immediately after the clock is restarted. To ensure that an
interrupt will be accepted to release the STP or WIT state, the
corresponding interrupt enable bit must be set to “1” before the
STP or WIT instruction is executed.
Fig. 41 External circuit of ceramic resonator/quartz-crystal
oscillator
Fig. 42 Structure of CPU mode register
XIN
XOUT
CIN
COUT
Rd
M37545
Note: Insert a damping resistor if required.
The resistance will vary depending on the oscillator and the
oscillation drive capacity setting.
Use the value recommended by the maker of the oscillator.
Also, if the oscillator manufacturer’s data sheet specifies
that a feedback resistor be added external to the chip
though a feedback resistor exists on-chip, insert a feedback
resistor between XIN and XOUT following the instruction.
Processor mode bits (Note)
b1 b0
0
0 Single-chip mode
0
1
0
1
Not available
b7
b0
Note : The bit can be rewritten only once after releasing reset.
After rewriting, it is disabled to write any data to this bit.
However, by reset the bit is initialized and can be rewritten, again.
It is not disabled to write any data to this bit for emulator MCU gM37545RLSS.h
CPU mode register
(CPUM: address 003B16, initial value: 8016)
Stack page selection bit
0 : 0 page
1 : 1 page
Clock division ratio selection bits
b7 b6
0
0 : Not available
0
1 : Not available
1
0 : f(f) = f(XIN)/4
1
1 : Not available
Not used (returns g0h when read)
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