參數(shù)資料
型號： M37549G1-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數(shù)： 46/84頁
文件大小： 1378K
代理商： M37549G1-XXXFP
Rev.2.02
Mar 31, 2009
Page 50 of 81
REJ03B0202-0202
7549 Group
Fig 65. Block diagram of internal clock generating circuit
“00”: Low-speed mode
High-speed on-chip
oscillator (HSOCO)
1/4
1/2
Timing
φ
(Internal clock)
φSOURCE
“10”: High-speed mode
Clock division ratio selection bits
WIT
instruction
Low-speed on-chip
oscillator (LSOCO)
1/8
“01”: Middle-speed mode
“11”: Double-speed mode
Peripheral
function clock
generation circuit
(1/1 to 1/256)
Clock selection bits
High-speed on-chip oscillator
oscillation control bit
Low-speed on-chip oscillator
oscillation control bit
1/16
Prescaler 12
Timer 1
Oscillation stabilization time set timer
after release of the STP instruction
SQ
R
Reset
Interrupt disable flag I
Interrupt request
XIN/XCIN oscillation
control bit
Bits 0 and 1 of FSROM1: setting of the oscillation method select bits
“00”: Clock pins not used
P21/XIN/XCIN
Port P21
control circuit
P20/XOUT/XCOUT
Port P20
control circuit
“10”
“01”
“00”
It is not possible to write “1” to the low-speed on-chip
oscillator oscillation control bit if low-speed on-chip
oscillator stop has been disabled by bit 4 in FSROM2.
Also, the low-speed on-chip oscillator does not stop
even if the STP instruction is executed.
XIN oscillation cannot be
selected as
φSOURCE
if clock pins not used is
selected.
P21/XIN/XCIN
Port P21
control circuit
P20/XOUT/XCOUT
“11”: External clock input
Noise filter
P21/XIN/XCIN
P20/XOUT/XCOUT
Rf
“10”: 32 kHz quartz-
crystal oscillation
P21/XIN/XCIN
P20/XOUT/XCOUT
Rf
“01”: Ceramic or quartz-
crystal oscillation
1/1 to 1/256
Peripheral
function
(Note 2)
Reset
SQ
R
QS
STP instruction
R
Notes 1: The oscillation circuit is built in the P20/XOUT/XCOUT pin and the P21/XIN/XCIN pin. When the Vcc of the microcomputer
is lower than the operation lower bound voltage even if these pins are used as I/O ports, the oscillation circuit is
connected and undefined values may be output from these pins.
2: Although a feed-back resistor exists on-chip, an external feed-back resistor may be needed depending on conditions.
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