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| 型號(hào)： | M37542F8VGP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁(yè)數(shù)： | 38/139頁(yè) |
| 文件大小： | 1448K |
| 代理商： | M37542F8VGP |
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7542 Group
Rev.3.02
Oct 31, 2006
Page 132 of 134
REJ03B0006-0302
6. A/D conversion accuracy
As for AD translation accuracy, on the following operating condi-
tions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sen-
sitive to noise when VREF voltage is set up lower than Vcc
voltage, accuracy may become low rather than the case
where VREF voltage and Vcc voltage are set up to the same
value..
(2) When VREF voltage is lower than [ 3.0 V ], the accuracy at the
low temperature may become extremely low compared with
that at room temperature. When the system would be used at
low temperature, the use at VREF=3.0 V or more is recom-
mended.
Notes on Watchdog Timer
1. The watchdog timer is operating during the wait mode. Write
data to the watchdog timer control register to prevent timer un-
derflow.
2. The watchdog timer stops during the stop mode. However, the
watchdog timer is running during the oscillation stabilizing time
after the STP instruction is released. In order to avoid the un-
derflow of the watchdog timer, the watchdog timer control
register must be written just before executing the STP instruc-
tion.
3. The STP instruction function selection bit (bit 6 of watchdog
timer control register (address 003916)) can be rewritten only
once after releasing reset. After rewriting it is disable to write
any data to this bit.
4. A count source of watchdog timer is affected by the clock divi-
sion selection bit of the CPU mode register.
The f(XIN) clock is supplied to the watchdog timer when select-
ing f(XIN) as the CPU clock.
The on-chip oscillator output is supplied to the watchdog timer
when selecting the on-chip oscillator output as the CPU clock.
Notes on RESET pin
1. Connecting capacitor
In case where the RESET signal rise time is long, connect a ce-
ramic capacitor or others across the RESET pin and the Vss pin.
And use a 1000 pF or more capacitor for high frequency use.
When connecting the capacitor, note the following :
Make the length of the wiring which is connected to a capacitor
as short as possible.
Be sure to verify the operation of application products on the
user side.
<Reason>
If the several nanosecond or several ten nanosecond impulse
noise enters the RESET pin, it may cause a microcomputer fail-
ure.
Notes on A/D conversion
1. Analog input pin
Make the signal source impedance for analog input low, or equip
an analog input pin with an external capacitor of 0.01F to 1F.
Further, be sure to verify the operation of application products on
the user side.
<Reason>
An analog input pin includes the capacitor for analog voltage com-
parison. Accordingly, when signals from signal source with high
impedance are input to an analog input pin, charge and discharge
noise generates. This may cause the A/D conversion/comparison
precision to be worse.
2. Clock frequency during A/D conversion
The comparator consists of a capacity coupling, and a charge of
the capacity will be lost if the clock frequency is too low. This may
cause the A/D conversion precision to be worse. Accordingly, set
f(XIN) in order that the A/D conversion clock is 250 kHz or over
during A/D conversion.
3. A/D conversion clock selection
Select f(XIN)/2 as an A/D conversion clock by setting the A/D con-
version clock selection bit (bit 3 of A/D control register (address
3416)) when RC oscillation is used.
The f(XIN) can be also used as an A/D conversion clock only when
ceramic oscillation or on-chip oscillator is used.
4. Analog input pin selection
P26/AN6 and P27/AN7 can be used only for PRSP0036GA-A pack-
age version.
5. Read A/D conversion register
8-bit read
Read only the A/D conversion low-order register (address 3516).
10-bit read
Read the A/D conversion high-ordrer register (address 3616) first,
and then, read the A/D conversion low-order register (address
3516).
In this case, the high-order 6 bits of address 3616 returns “0”
when read.
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相關(guān)代理商/技術(shù)參數(shù) |
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| M37542M2-XXXFP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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| M37542M2-XXXSP | 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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