參數(shù)資料
型號: M34559G6
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機的CMOS
文件頁數(shù): 63/148頁
文件大?。?/td> 1732K
代理商: M34559G6
Rev.1.04
REJ03B0188-0104
Aug 23, 2007
Page 63 of 146
4559 Group
(5) External clock
When the external clock signal is used as the main clock
(f(X
IN
)), connect the X
IN
pin to the clock source and leave X
OUT
pin open (Figure 64). Do not execute the CRCK instruction.
Be careful that the maximum value of the oscillation frequency
when using the external clock differs from the value when using
the ceramic resonator (refer to the recommended operating
condition). Also, note that the power down mode (POF and
POF2 instructions) cannot be used when using the external clock.
(6) Sub-clock generating circuit f(X
CIN
)
Sub-clock signal f(X
CIN
) is obtained by externally connecting a
quartz-crystal oscillator. Connect this external circuit and a
quartz-crystal oscillator to pins X
CIN
and X
COUT
at the shortest
distance. A feedback resistor is built in between pins X
CIN
and
X
COUT
(Figure 65). X
CIN
pin and X
COUT
pin are also used as
ports D
6
and D
7
, respectively. The sub-clock oscillation circuit is
invalid and the function of ports D
6
and D
7
are valid by setting
bit 2 of register RG to “1”.
When sub-clock, ports D
6
and D
7
are not used, connect X
CIN
/D
6
to V
SS
and leave X
COUT
/D
7
open.
Fig 64. External clock input circuit
Fig 65. External quarts-crystal circuit
4559
X
IN
X
OUT
External oscillation circuit
V
DD
V
SS
*
Do not use the CRCK instruction
in program.
4559
X
CIN
X
COUT
Rd
C
IN
C
OUT
Note: Externally connect a damping resistor Rd
depending on the oscillation frequency.
(A feedback resistor is built-in.)
Use the quartz-crystal manufacturer’s
recommended value because constants such as
capacitance depend on the resonator.
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