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參數(shù)資料
| 型號： | 3820 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 41/66頁 |
| 文件大?。?/td> | 1093K |
| 代理商： | 3820 |
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41
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
CLOCK GENERATING CIRCUIT
The 3820 group has two built-in oscillation circuits. An oscillation
circuit can be formed by connecting a resonator between X
IN
and
X
OUT
(X
CIN
and X
COUT
). Use the circuit constants in accordance
with the resonator manufacturer's recommended values. No exter-
nal resistor is needed between X
IN
and X
OUT
since a feed-back re-
sistor exists on-chip. However, an external feed-back resistor is
needed between X
CIN
and X
COUT
.
To supply a clock signal externally, input it to the X
IN
pin and make
the X
OUT
pin open. The sub-clock X
CIN
-X
COUT
oscillation circuit
cannot directly input clocks that are externally generated. Accord-
ingly, be sure to cause an external resonator to oscillate.
Immediately after poweron, only the X
IN
oscillation circuit starts
oscillating, and X
CIN
and X
COUT
pins function as I/O ports. The
pull-up resistor of X
CIN
and X
COUT
pins must be made invalid to
use the sub-clock.
Frequency Control
Middle-speed mode
The internal clock
φ
is the frequency of X
IN
divided by 8.
After reset, this mode is selected.
High-speed mode
The internal clock
φ
is half the frequency of X
IN
.
Low-speed mode
The internal clock
φ
is half the frequency of X
CIN
.
A low-power consumption operation can be realized by stopping
the main clock X
IN
in this mode. To stop the main clock, set bit 5
of the CPU mode register to “1”.
When the main clock X
IN
is restarted, set enough time for oscil-
lation to stabilize by programming.
Note:
If you switch the mode between middle/high-speed and low-
speed, stabilize both X
IN
and X
CIN
oscillations. The suffi-
cient time is required for the sub-clock to stabilize, espe-
cially immediately after poweron and at returning from stop
mode. When switching the mode between middle/high-
speed and low-speed, set the frequency on condition that
f(X
IN
)>3f(X
CIN
).
Fig. 35 Ceramic resonator circuit
Fig. 36 External clock input circuit
X
CIN
X
COUT
X
IN
X
OUT
C
IN
C
OUT
C
CIN
C
COUT
Rf
Rd
X
IN
X
OUT
External oscillation
circuit
Open
V
CC
V
SS
C
CIN
C
COUT
Rf
Rd
X
CIN
X
COUT
Oscillation Control
Stop mode
If the STP instruction is executed, the internal clock
φ
stops at an
“H” level, and X
IN
and X
CIN
oscillators stop. Timer 1 is set to “FF
16
”
and timer 2 is set to “01
16
”.
Either X
IN
or X
CIN
divided by 16 is input to timer 1 as count
source, and the output of timer 1 is connected to timer 2.
The bits of the timer 123 mode register except bit 4 are cleared to
“0”. Set the timer 1 and timer 2 interrupt enable bits to disabled
(“0”) before executing the STP instruction.
Oscillator restarts at reset or when an external interrupt is re-
ceived, but the internal clock
φ
is not supplied to the CPU until
timer 2 underflows. This allows time for the clock circuit oscillation
to stabilize.
Wait mode
If the WIT instruction is executed, the internal clock
φ
stops at an
“H” level. The states of X
IN
and X
CIN
are the same as the state be-
fore the executing the WIT instruction. The internal clock restarts
at reset or when an interrupt is received. Since the oscillator does
not stop, normal operation can be started immediately after the
clock is restarted.
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