參數(shù)資料
型號(hào)： M37736MHBXXXGP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁(yè)數(shù)： 57/96頁(yè)
文件大小： 1328K
代理商： M37736MHBXXXGP
57
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI MICROCOMPUTERS
M37736MHBXXXGP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
OSCILLATION CIRCUIT
In the oscillation circuit, two kinds of clock circuits are built-in. One is
the main-clock oscillation circuit which uses the X
IN
and X
OUT
pins,
and the other is the sub-clock (32 kHz) oscillation circuit which uses
the X
CIN
and the X
COUT
pins.
Either of these two oscillation circuits can output the system clock,
and it can be selected.
Figure 62 shows the oscillation circuit example with a ceramic
resonator or a quartz-crystal oscillator connected. The circuit
constants such as capacitance depend on a resonator/oscillator, and
these constants shall be set to the resonator/oscillator manufacture’s
recommended value.
Figure 63 shows the example of the external clock input circuit.
When inputting the main clock externally, the main-clock oscillation
circuit stops operating and power dissipation could be conserved by
setting the main clock external input selection bit (bit 1 of the oscillation
circuit control register 1, refer to Figure 64) to “1”. Note that this bit
also has the function to select a return factor from STP state (refer to
the section on the STANDBY FUNCTION.) Additionally, write to the
oscillation circuit control register 1 as the flow shown in Figure 65.
Pins X
CIN
and X
COUT
of the sub-clock oscillation circuit are also used
as I/O ports P7
7
and P7
6
, and these functions are selected with the
port-X
C
selection bit described below.
From the time during reset to the time after releasing reset, only the
main-clock oscillation circuit operates and the main clock is selected
as the system clock. Furthermore, at this time, the sub-clock oscillation
circuit stops and pins X
CIN
and X
COUT
become I/O ports (P7
7
, P7
6
).
When the port-X
C
selection bit (bit 4 of the oscillation circuit control
register 0) is set to “1” in this condition, I/O ports P7
7
and P7
6
are
switched to pins X
CIN
and X
COUT
, and then, oscillation starts in the
sub-clock oscillation circuit.
X
IN
X
OUT
X
CIN
P7
6
Left open
External oscillation circuit
Vcc
Vss
Vcc
Vss
(P7
6
as I/O port)
External oscillation circuit
When inputting the main clock externally, set the main clock
external input selection bit to “1”. Then, leave the X
OUT
pin
open.
When inputting the sub clock externally, set the sub-clock
external input selection bit to “1”. Then, port P7
6
becomes an
I/O port.
Fig. 63 External clock input circuit
When inputting the sub clock externally, set the sub-clock external
input selection bit (bit 2 of the oscillation circuit control register 1) to
“1” before selecting pins X
CIN
and X
COUT
with the port-Xc selection
bit. When the sub-clock external input selection bit is set to “1”, port
P7
6
becomes an I/O port (or an analog input AN
6
). Note that this bit
also has the function to select a return factor from STP state (refer to
the section on the STANDBY FUNCTION.)
When the sub-clock output selection bit (bit 1 of the port function
control register, refer to Figure 11) is set to “1” under the condition of
the port-Xc selection bit = “1”, the sub-clock
port P6
7
. Accordingly, the sub-clock 32 kHz can be supplied for
external devices.
SUB
is output from
Rf
Rd
C
IN
C
OUT
X
IN
X
OUT
X
CIN
X
COUT
Rcf
Rcd
C
CIN
C
COUT
(32 kHz)
In this case, sub-clock oscillation circuit is used.
(Port-Xc selection bit is “1”)
Rf
Rd
C
IN
C
OUT
X
IN
X
OUT
P7
7
P7
6
(P7
7
, P7
6
as I/O port)
In this case, sub-clock oscillation circuit is not used.
( Port-Xc selection bit is “0”)
Fig. 62 Oscillation circuit example with external resonator or quartz-crystal oscillator
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