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参数资料
| 型号： | M37540M2T-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件页数： | 46/88页 |
| 文件大小： | 872K |
| 代理商： | M37540M2T-XXXFP |
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7540 Group
Rev.4.00
Jun 21, 2004
page 50 of 82
REJ03B0011-0400Z
s Timer Z: Programmable Wait One-shot
Generation Mode
Count set value
In the programmable wait one-shot generation mode, values of
TZS, EXPZP and EXPZS are valid by writing to TZP. Even when
changing TZP is not required, write the same value again.
Write timing to TZP
In the programmable wait one-shot generation mode, when the
setting value is changed while the waveform is output, set by soft-
ware in order not to execute the writing to TZP and the timing of
timer underflow during the secondary interval simultanesously.
Usage of waveform extension function
The waveform extension function by the timer Z waveform exten-
sion control bit can be used only when “0016” is set to Prescaler Z.
When the value other than “0016” is set to Prescaler Z, be sure to
set “0” to EXPZP and EXPZS. Also, when the timer Y underflow is
selected as the count source, the waveform extension function
cannot be used.
Timer Z write mode
When using this mode, be sure to set “1” to the timer Z write con-
trol bit to select “write to latch only”.
Timer Z can stop counting by setting “1” to the timer Z count stop
bit in any mode.
Also, when Timer Z underflows, the timer Z interrupt request bit is
set to “1”.
Timer Z reloads the value of latch when counting is stopped by the
timer Z count stop bit. (When timer is read out while timer is
stopped, the value of latch is read. The value of timer can be read
out only while timer is operating.)
s Serial I/O
Serial I/O interrupt
When setting the transmit enable bit to “1”, the serial I/O transmit
interrupt request bit is automatically set to “1”. When not requiring
the interrupt occurrence synchronized with the transmission en-
abled, take the following sequence.
Set the serial I/O transmit interrupt enable bit to “0” (disabled).
Set the transmit enable bit to “1”.
Set the serial I/O transmit interrupt request bit to “0” after 1 or
more instructions have been executed.
Set the serial I/O transmit interrupt enable bit to “1” (enabled).
I/O pin function when serial I/O1 is enabled.
The functions of P12 and P13 are switched with the setting values
of a serial I/O1 mode selection bit and a serial I/O1 synchronous
clock selection bit as follows.
(1) Serial I/O1 mode selection bit
→ “1” :
Clock synchronous type serial I/O is selected.
Setup of a serial I/O1 synchronous clock selection bit
“0” : P12 pin turns into an output pin of a synchronous clock.
“1” : P12 pin turns into an input pin of a synchronous clock.
Setup of a SRDY1 output enable bit (SRDY)
“0” : P13 pin can be used as a normal I/O pin.
“1” : P13 pin turns into a SRDY output pin.
(2) Serial I/O1 mode selection bit
→ “0” :
Clock asynchronous (UART) type serial I/O is selected.
Setup of a serial I/O1 synchronous clock selection bit
“0”: P12 pin can be used as a normal I/O pin.
“1”: P12 pin turns into an input pin of an external clock.
When clock asynchronous (UART) type serial I/O is selected, it is
P13 pin. It can be used as a normal I/O pin.
s A/D Converter
The comparator uses internal capacitors whose charge will be
lost if the clock frequency is too low.
Make sure that f(XIN) is 500kHz or more during A/D conversion.
As for AD translation accuracy, on the following operating condi-
tions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sensi-
tive 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 tem-
perature, the use at VREF=3.0 V or more is recommended.
s Notes on clock generating circuit
For use with the oscillation stabilization set bit after release of the
STP instruction set to “1”, set values in timer 1 and prescaler 1 after fully
appreciating the oscillation stabilization time of the oscillator to be used.
Switch of ceramic and RC oscillations
After releasing reset the operation starts by starting an on-chip os-
cillator. Then, a ceramic oscillation or an RC oscillation is selected
by setting bit 5 of the CPU mode register.
Double-speed mode
When a ceramic oscillation is selected, a double-speed mode can
be used. Do not use it when an RC oscillation is selected.
CPU mode register
Bits 5, 1 and 0 of CPU mode register are used to select oscillation
mode and to control operation modes of the microcomputer. In or-
der to prevent the dead-lock by error-writing (ex. program
run-away), these bits can be rewritten only once after releasing re-
set. After rewriting it is disable to write any data to the bit. (The
emulator MCU “M37540RSS” is excluded.)
Also, when the read-modify-write instructions (SEB, CLB) are ex-
ecuted to bits 2 to 4, 6 and 7, bits 5, 1 and 0 are locked.
Clock division ratio, XIN oscillation control, on-chip oscillator control
The state transition shown in Fig. 53 can be performed by setting
the clock division ratio selection bits (bits 7 and 6), XIN oscillation
control bit (bit 4), on-chip oscillator oscillation control bit (bit 3) of
CPU mode register. Be careful of notes on use in Fig. 53.
On-chip oscillator operation
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37540M2T-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2V-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540M2V-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540M2-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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