參數(shù)資料
型號(hào): M38D24G4-XXXFP
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁(yè)數(shù): 44/136頁(yè)
文件大小: 2856K
代理商: M38D24G4-XXXFP
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Rev.3.02
Apr 10, 2008
Page 15 of 131
REJ03B0177-0302
38D2 Group
Fig. 8 Switch procedure of CPU mode register
After releasing reset
N
Y
Low-speed/XIN mode ?
Start the oscillation
(bits 4 and 5 of CPUM)
Oscillator starts oscillation.
Do not change bit 3, bit 6 and bit 7
of CPUM until oscillation stabilizes.
Select internal system clock
(bit 3 of CPUM or bit 7, 6 = “01”)
Wait by on-chip oscillator operation until
establishment of oscillator clock
Switch the main clock division ratio
selection bit (bit 7, 6 = “00” or “10”)
Start with an on-chip oscillator.
Initial value of CPUM is E016.
Initial value of CPUM2 is 0016.
As for the details of condition for
transition among each mode,
refer to the state transition of
system clock.
System can operate in on-chip
oscillator mode until oscillation
stabilize.
Select internal system clock.
Do not change bit 3, bit 6 and bit
7 of CPUM at the same time.
Select main clock division ratio.
Switch to frequency/2 or frequency/4 mode here,
if necessary.
Main routine
Reset
L
OSCSEL ?
After releasing reset
Wait by operation until establishment
H
The CPU starts its operation
in the built-in XIN mode.
Initial value of CPUM is 4016.
Initial value of CPUM2 is 0116.
After releasing reset
N
Y
Low-speed/XIN mode ?
Start the oscillation
(bits 4 and 5 of CPUM)
Oscillator starts oscillation.
Do not change bit 3, bit 6 and bit 7 of CPUM until
oscillation stabilizes.
Select internal system clock
(bit 3 of CPUM or bit 7, 6 = “01”)
Wait by on-chip oscillator operation until
establishment of oscillator clock
Switch the main clock division ratio
selection bit (bit 7, 6 = “00” or “10”)
Start with an on-chip oscillator.
Initial value of CPUM is E016.
Initial value of CPUM2 is 0016.
As for the details of condition for
transition among each mode,
refer to the state transition of system clock.
System can operate in on-chip oscillator mode until
oscillation stabilize.
Select internal system clock.
Do not change bit 3, bit 6 and bit 7 of CPUM at the
same time.
Select main clock division ratio.
Switch to frequency/2 or 4 mode here, if necessary.
Main routine
Reset
<QzROM version>
<Flash memory version>
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M38D24G6FP#U0 功能描述:IC 740/38D2 MCU QZ-ROM 80QFP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:740/38000 標(biāo)準(zhǔn)包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI,I²C,UART/USART 外圍設(shè)備:POR,PWM,WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:- 程序存儲(chǔ)器類(lèi)型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC(J 形引線) 包裝:帶卷 (TR)
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