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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： | 44/88页 |
| 文件大小： | 872K |
| 代理商： | M37540M2T-XXXFP |
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7540 Group
Rev.4.00
Jun 21, 2004
page 49 of 82
REJ03B0011-0400Z
NOTES ON PERIPHERAL FUNCTIONS
s Interrupt
When setting the followings, the interrupt request bit may be set to “1”.
When setting external interrupt active edge
Related register: Interrupt edge selection register (address 003A16)
Timer X mode register (address 2B16)
Timer A mode register (address 1D16)
When not requiring the interrupt occurrence synchronized with
these setting, take the following sequence.
Set the corresponding interrupt enable bit to “0” (disabled).
Set the interrupt edge select bit (active edge switch bit) to “1”.
Set the corresponding interrupt request bit to “0” after 1 or
more instructions have been executed.
Set the corresponding interrupt enable bit to “1” (enabled).
s Timers
When n (0 to 255) is written to a timer latch, the frequency divi-
sion ratio is 1/(n+1).
When a count source of timer X, timer Y or timer Z is switched,
stop a count of timer X.
s Timer A
CNTR1 interrupt active edge selection
CNTR1 interrupt active edge depends on the CNTR1 active edge switch bit.
When this bit is “0”, the CNTR1 interrupt request bit is set to “1” at
the falling edge of the CNTR1 pin input signal. When this bit is “1”,
the CNTR1 interrupt request bit is set to “1” at the rising edge of
the CNTR1 pin input signal.
However, in the pulse width HL continuously measurement mode,
CNTR1 interrupt request is generated at both rising and falling
edges of CNTR1 pin input signal regardless of the setting of
CNTR1 active edge switch bit.
s Timer X
CNTR0 interrupt active edge selection
CNTR0 interrupt active edge depends on the CNTR0 active edge switch bit.
When this bit is “0”, the CNTR0 interrupt request bit is set to “1” at the falling
edge of CNTR0 pin input signal. When this bit is “1”, the CNTR0 interrupt re-
quest bit is set to “1” at the rising edge of CNTR0 pin input signal.
s Timer Y: Programmable Generation
Waveform Mode
Count set value
In the programmable waveform generation mode, values of TYS,
EXPYP, and EXPYS are valid by writing to TYP because the set-
ting to them is executed all at once by writing to TYP. Even when
changing TYP is not required, write the same value again.
Write timing to TYP
In the programmable waveform generation mode, when the set-
ting value is changed while the waveform is output, set by
software in order not to execute the writing to TYP and the timing
of timer underflow during the secondary interval simultanesously.
Usage of waveform extension function
The waveform extension function by the timer Y waveform exten-
sion control bit can be used only when “0016” is set to Prescaler Y.
When the value other than “0016” is set to Prescaler Y, be sure to
set “0” to EXPYP and EXPYS.
Timer Y write mode
When using this mode, be sure to set “1” to the timer Y write con-
trol bit to select “write to latch only”.
Timer Y can stop counting by setting “1” to the timer Y count stop bit
in any mode.
Also, when Timer Y underflows, the timer Y interrupt request bit is
set to “1”.
Timer Y reloads the value of latch when counting is stopped by the
timer Y 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 Timer Z: Programmable Waveform
Generation Mode
Count set value
In the programmable waveform generation mode, values of TZS,
EXPZP, and EXPZS are valid by writing to TZP because the set-
ting to them is executed all at once by writing to TZP. Even when
changing TZP is not required, write the same value again.
Write timing to TZP
In the programmable waveform generation mode, when the set-
ting value is changed while the waveform is output, set by
software 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 extension
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”.
s Timer Z: Programmable One-shot
Generation Mode
Count set value
In the programmable one-shot generation mode, the value of
EXPZP becomes valid by writing to TZP. Even when changing
TZP is not required, write the same value again.
Write timing to TZP
In the programmable one-shot generation mode, when the setting
value is changed while the waveform is output, set by software in
order not to execute the writing to TZP and the timing of timer un-
derflow simultanesously.
Usage of waveform extension function
The waveform extension function by the timer Z waveform extension con-
trol 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.
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”.
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相关代理商/技术参数 |
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|---|---|
| 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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