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參數(shù)資料
| 型號： | M38037M8H-XXXWG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PBGA64 |
| 封裝： | 6 X 6 MM, 0.65 MM PITCH, PLASTIC, FLGA-64 |
| 文件頁數(shù)： | 73/111頁 |
| 文件大?。?/td> | 1205K |
| 代理商： | M38037M8H-XXXWG |
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Rev.3.02
Nov 05, 2004
page 64 of 108
3803 Group (Spec. H)
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
CLOCK GENERATING CIRCUIT
The 3803 group (Spec. H) has two built-in oscillation circuits: main
clock XIN-XOUT oscillation circuit and sub clock XCIN-XCOUT oscil-
lation circuit. An oscillation circuit can be formed by connecting a
resonator between XIN and XOUT (XCIN and XCOUT). Use the cir-
cuit 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.)
However, an external feed-back resistor is needed between XCIN
and XCOUT.
Immediately after power on, only the XIN oscillation circuit starts
oscillating, and XCIN and XCOUT pins function as I/O ports.
Frequency Control
(1) Middle-speed mode
The internal clock
φ is the frequency of XIN divided by 8. After re-
set is released, this mode is selected.
(2) High-speed mode
The internal clock
φ is half the frequency of XIN.
(3) Low-speed mode
The internal clock
φ is half the frequency of XCIN.
(4) Low power dissipation mode
The low power consumption operation can be realized by stopping
the main clock XIN in low-speed mode. To stop the main clock, set
bit 5 of the CPU mode register to “1.” When the main clock XIN is
restarted (by setting the main clock stop bit to “0”), set sufficient
time for oscillation to stabilize.
Oscillation Control
(1) Stop mode
If the STP instruction is executed, the internal clock
φ stops at an
“H” level, and XIN and XCIN oscillators stop. When the oscillation
stabilizing time set after STP instruction released bit is “0,” the
prescaler 12 is set to “FF16” and timer 1 is set to “0116.” When the
oscillation stabilizing time set after STP instruction released bit is
“1,” set the sufficient time for oscillation of used oscillator to stabi-
lize since nothing is set to the prescaler 12 and timer 1.
After STP instruction is released, the input of the prescaler 12 is
connected to count source which had set at executing the STP in-
struction, and the output of the prescaler 12 is connected to timer
1. Set the timer 1 interrupt enable bit to disabled (“0”) before ex-
ecuting the STP instruction. Oscillator restarts when an external
interrupt is received, but the internal clock
φ is not supplied to the
CPU (remains at “H”) until timer 1 underflows. The internal clock
φ
is supplied for the first time, when timer 1 underflows. Therefore
make sure not to set the timer 1 interrupt request bit to “1” before
the STP instruction stops the oscillator. When the oscillator is re-
started by reset, apply “L” level to the RESET pin until the
oscillation is stable since a wait time will not be generated.
With the flash memory version, the internal power supply circuit is
changed to low power consumption mode for consumption current
reduction at the time of STP instruction execution.
Although an internal power supply circuit is usually changed to the
normal operation mode at the time of the return from an STP in-
struction, since a certain time is required to start the power supply
to the flash memory and operation of flash memory to be enabled,
set wait time 100
s or more with the flash memory version by the
oscillation stabilization time set function after release of the STP
instruction which used the timer 1.
(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
φ re-
starts when an interrupt is received. Since the oscillator does not
stop, normal operation can be started immediately after the clock
is restarted.
sNote
If you switch the mode between middle/high-speed and low-
speed, stabilize both XIN and XCIN oscillations. The sufficient time
is required for the sub clock to stabilize, especially immediately
after power on and at returning from stop mode. When switching
the mode between middle/high-speed and low-speed, set the fre-
quency on condition that f(XIN) > 3f(XCIN).
When using the quartz-crystal oscillator of high frequency, such
as 16 MHz etc., it may be necessary to select a specific oscillator
with the specification demanded.
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