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参数资料
| 型号： | M38507F8AFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PDSO42 |
| 封装： | 8.40 X 17.50 MM, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件页数： | 32/59页 |
| 文件大小： | 885K |
| 代理商： | M38507F8AFP |
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Rev.2.13
Apr 17, 2009
Page 38 of 56
REJ03B0125-0213
3850 Group (Spec.A QzROM version)
CLOCK GENERATING CIRCUIT
The 3850 group (spec. A QzROM version) has two built-in
oscillation circuits. An oscillation circuit can be formed by
connecting a resonator between XIN and XOUT (XCIN and
XCOUT). Use the circuit constants in accordance with the
resonator manufacturer’s recommended values. No external
resistor is needed between XIN and XOUT since a feed-back
resistor exists on-chip.(An external feed-back resistor may be
needed depending on conditions.) However, an external feed-
back resistor is needed between XCIN and XCOUT.
Immediately after power on, only the XIN oscillation circuit
starts oscillating, and XCIN and XCOUT pins function as I/O ports.
Frequency Control
(1) Middle-speed mode
The internal clock
φ is the frequency of XIN divided by 8. After
reset is released, this mode is selected.
(2) High-speed mode
The internal clock
φ is half the frequency of XIN.
(3) Low-speed mode
The internal clock
φ is half the frequency of XCIN.
(4) Low power dissipation mode
The low power consumption operation can be realized by
stopping the main clock XIN in low-speed mode. To stop the
main clock, set bit 5 of the CPU mode register to “1”. When the
main clock XIN is restarted (by setting the main clock stop bit to
“0”), set sufficient time for oscillation to stabilize.
The sub-clock XCIN-XCOUT oscillating circuit can not directly
input clocks that are generated externally. Accordingly, make
sure to cause an external resonator to oscillate.
<Note>
The internal reset may not be generated correctly in the middle-
speed mode, depending on the underflow timing of the watchdog
timer.
When using the watchdog timer, operate the MCU in any mode
other than the middle-speed mode.
Oscillation Control
(1) Stop mode
If the STP instruction is executed, the internal clock
φ stops at an
“H” level, and XIN and XCIN oscillation stops. When the
oscillation stabilizing time set after STP instruction released bit
(bit 0 of address 003816) is “0”, the prescaler 12 is set to “FF16”
and timer 1 is set to “0116”. When the oscillation stabilizing time
set after STP instruction released bit is “1”, set the sufficient time
for oscillation of used oscillator to stabilize since nothing is set to
the prescaler 12 and timer 1.
After STP instruction is released, the input of the prescaler 12 is
connected to count source which had set at executing the STP
instruction, and the output of the prescaler 12 is connected to
timer 1. Oscillator restarts when an external interrupt is received,
but the internal clock
φ is not supplied to the CPU (remains at
“H”) until timer 1 underflows. The internal clock
φ is supplied
for the first time, when timer 1 underflows. This ensures time for
the clock oscillation using the ceramic resonators to be
stabilized. When the oscillator is restarted by reset, apply “L”
level to the RESET pin until the oscillation is stable since a wait
time will not be generated.
(2) Wait mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level, but the oscillator does not stop. The internal clock
φ
restarts at reset or when an interrupt is received. Since the
oscillator does not stop, normal operation can be started
immediately after the clock is restarted.
To ensure that the interrupts will be received to release the STP
or WIT state, their interrupt enable bits must be set to “1” before
executing of the STP or WIT instruction.
When releasing the STP state,
the input of the prescaler and
timer 1 is connected to the count source which had set at
executing the STP instruction and the prescaler 12 and
timer 1 will start counting. Set the timer 1 interrupt enable
bit to “0” before executing the STP instruction.
<Notes>
If you switch the mode between middle/high-speed and low-
speed, stabilize both XIN and XCIN oscillations. The sufficient
time is required for the sub-clock to stabilize, especially
immediately after power on and at returning from the stop
mode. When switching the mode between middle/high-speed
and low-speed, set the frequency on condition that f(XIN) > 3
×
f(XCIN).
When using the oscillation stabilizing time set after STP
instruction released bit set to “1”, evaluate time to stabilize
oscillation of the used oscillator and set the value to the timer 1
and prescaler 12.
Fig 42. Ceramic resonator circuit
Fig 43. External clock input circuit
CIN
COUT
CCIN
CCOUT
Rf
Rd
Rd (Note)
Notes : Insert a damping resistor if required.
The resistance will vary depending on the oscillator and
the oscillation drive capacity setting.
Use the value recommended by the maker of the
oscillator.
Also, if the oscillator manufacturer's data sheet specifies
to add a feedback resistor externally to the chip though a
feedback resistor exists on-chip, insert a feedback
resistor between XIN and XOUT following the instruction.
XCIN XCOUT
XIN
XOUT
XIN
XOUT
External oscillation
circuit
VCC
VSS
Open
CCIN
CCOUT
Rf
Rd
XCIN
XCOUT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M38507F8AFP#U1 | 功能描述:IC 740/3850 MCU FLASH 42SSOP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 产品培训模块:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 标准包装:1 系列:M16C™ M32C/80/87 核心处理器:M32C/80 芯体尺寸:16/32-位 速度:32MHz 连通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外围设备:DMA，POR，PWM，WDT 输入/输出数:121 程序存储器容量:384KB（384K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:24K x 8 电压 - 电源 (Vcc/Vdd):3 V ~ 5.5 V 数据转换器:A/D 34x10b，D/A 2x8b 振荡器型:内部 工作温度:-20°C ~ 85°C 封装/外壳:144-LQFP 包装:托盘 产品目录页面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M38507F8AFP#W1 | 制造商:Renesas Electronics Corporation 功能描述:MCU 3/5V 32K PB-FREE 42-SSOP T&R - Tape and Reel |
| M38507F8FP | 制造商:Renesas Electronics Corporation 功能描述:MCU 8-Bit 740 CISC 32KB Flash 5V 42-Pin SSOP 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT 740 CISC 32KB FLASH 5V 42SSOP - Trays |
| M38507F8FP#U1 | 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT 740 CISC 32KB FLASH 5V 42SSOP - Trays |
| M38507F8FP#W1 | 制造商:Renesas Electronics Corporation 功能描述:FLASH 8-BIT 2.7 TO 5.5V PBFREE |
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