參數(shù)資料
型號: M38C59GFHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 6.25 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù): 52/71頁
文件大?。?/td> 939K
代理商: M38C59GFHP
Rev.2.00
Nov 23, 2005
page 56 of 75
REJ03B0098-0200
38C5 Group (One Time PROM version)
Fig. 56 Clock generating circuit block diagram
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.
S
R
Q
XIN
XOUT
XCOUT
XCIN
On-chip oscillator
1/2
1/4
S
R
Q
S
R
Q
1/4
Timer 1 count source
selection bits
Timer 2 count source
selection bits
“00”
“01”
WIT
instruction
System clock
φ
STP instruction
Timer 2
Timer 1
Interrupt request
Reset
Main clock division
ratio selection bit
CPUM BIT6
Interrupt disable flag I
STP instruction
Port Xc
switch bit
CPUM BIT4
Internal system
clock selection bit
CPUM BIT7
Frequency divider
for Timer
XIN-XOUT
oscillation stop bit
CPUM BIT5
Main clock selection bit
CPUM BIT3
Internal system clock
selection bit
CPUM BIT7 (Note 1)
Main clock selection bit
CPUM BIT3
“10”
“00”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
(Note 2)
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