参数资料
型号: M38D5XGXFP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 105/142页
文件大小: 2004K
代理商: M38D5XGXFP
Rev.3.04
May 20, 2008
Page 65 of 134
REJ03B0158-0304
38D5 Group
Fig. 62 Clock generating circuit block diagram
System clock
φ
Interrupt request
Interrupt disable flag I
Reset
WIT
instruction
S
R
Q
STP instruction
XIN-XOUT
oscillation stop bit
CPUM BIT5
XIN
XOUT
XCOUT
XCIN
Timer 1 count source
selection bits
Port Xc switch bit
CPUM BIT4
“00”
“01”
“10”
“11”
Main clock division
ratio selection bit
CPUM BIT7, 6
On-chip oscillator
Internal system clock
selection bit
CPUM BIT3
1/2
Internal system clock selection bit
“0”
“1”
STP instruction
S
R
Q
S
R
Q
“1”
“0”
Timer 1
Timer 2
“01”
“00”
Frequency divider
for Timer
Timer 2 count source
selection bits
“00”
“10”
(2)
1/4
1/2
“0”
“1”
“0”
CPUM2 BIT0
On-chip oscillator stop bit
Main clock
division ratio
selection bit
Notes 1: When the XCIN-XCOUT oscillation is selected as the system clock, set the port Xc
switch bit to “1”.
2: Although a feed-back resistor exists on-chip, an external
feed-back resistor may be needed depending on conditions.
3:
φSOURCE indicates the followings:
XIN input in the frequency/2, 4, or 8 mode
On-chip oscillator divided by 4 in the on-chip oscillator mode
Sub-clock in the low-speed mode
However, when used as the A/D conversion clock by the A/D converter,
φSOURCE indicates the followings:
XIN input in the frequency/2, 4, or 8 mode
On-chip oscillator divided by 4 in the low-speed or the on-chip oscillator mode
φSOURCE
CPUM BIT6
(1)
(3)
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