參數(shù)資料
型號: 38D5
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 64/141頁
文件大?。?/td> 2027K
代理商: 38D5
Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 64 of 134
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
X
IN
-X
OUT
oscillation stop bit
CPUM BIT5
X
IN
X
OUT
X
COUT
X
CIN
Timer 1 count source
selection bits
“01”
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
1/2
Internal system clock selection bit
“0”
“1”
STP instruction
S
R
Q
S
R
Q
“1”
“0”
Timer 1
Timer 2
“00”
Frequency divider
for Timer
Timer 2 count source
selection bits
“00”
“10”
(2)
1/4
1/2
“0”
“1”
“1”
“0”
“0”
CPUM2 BIT0
On-chip oscillator stop bit
Main clock
divisio ratio
selection bit
Notes 1
: When the X
CIN
-X
COUT
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
:
φ
SOURCE indicates the followings:
X
IN
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,
φ
SOURCE indicates the followings:
X
IN
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
φ
SOURCE
CPUM BIT6
(1)
(3)
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