參數(shù)資料
型號： M37540M4
廠商： Mitsubishi Electric Corporation
英文描述： CABLE ASSEMBLY; 7/16" MALE TO 7/16" MALE; 50 OHM, RG218/U COAX; 48" CABLE LENGTH
中文描述： 單芯片8位CMOS微機
文件頁數(shù)： 23/64頁
文件大小： 668K
代理商： M37540M4
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7540 Group
MITSUBISHI MICROCOMPUTERS
23
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
(4)Programmable wait one-shot generation mode
Mode select
Timer mode is selected by setting timer Z operation mode bits
(b5,b4) of TYZM to “11”.
When this mode is selected, set timer Z write control bit (b6) of
TYZM to “1” (“writing to only latch” selected).
Count source select
The count source is f(X
IN
)/2, f(X
IN
)/16 or timer Y underflow.
Interrupt
When an underflow occurs, timer Z interrupt request bit (b1) of
IREQ is set to “1”.
Operation description
After reset release, timer Z is operating because the timer Z count
stop bit (b7) of TYZM is “0”. MCU operates in the programmable
wait one-shot generation mode when timer Z operation mode bits
(b5, b4) of TYZM is set to “11” after timer Z operation is stopped by
setting b7 of TYZM to “1”.
Timer Z is enabled to accept the one-shot start trigger when “0” is
written to b7 of TYZM after the timer count values are set to the
timer Z primary latch (TZP) and the timer Z secondary latch (TZS).
In this state, when “1” is written to the timer Z one-shot start bit
(b0) of ONS, timer Z starts count operation. Unlike the program-
mable one-shot generation mode, the output of TZ
OUT
pin is not
changed until the timer counts TZP and an underflow occurs.
When the timer Z counts TZP and an underflow occurs, TZS is
reloaded to timer, at the same time, the output of the TZ
OUT
pin is
inverted.
Timer Z counts down the value of TZP and stops after the output
of TZ
OUT
pin is inverted to the same level as the initial state when
an underflow occurs. In this time, the next one-shot pulse can be
output by writing b0 of ONS to “1” because this bit is initialized to
“0”.
The active edge of the output waveform from TZ
OUT
pin is set by
the timer Z output level latch (b5) of PUM. When “0” is set to b5 of
PUM, the initial level of timer at stop and the TZP count interval
are “L” and inverted to “H” at the same time when an underflow
occurs. “H” is output in the count interval of TZS, and the output is
inverted to “L” and stopped when an underflow occurs.
Also, when “1” is set to b5 of PUM, the initial level of timer at stop
and the TZP count interval are “H” and inverted to “L” at the same
time when an underflow occurs. “L” is output in the count interval
of TZS, and the output is inverted to “H” and stopped when an
underflow occurs.
When the INT0 pin one-shot trigger control bit (b6) of PUM is set
to “1”, the one-shot pulse can be output by using the input of INT0
pin as a trigger. The active edge of the pulse input to INT0 pin as
the trigger can be selected by the INT0 pin one-shot trigger active
edge selection bit (b7) of PUM. The trigger is accepted and the
one-shot pulse is generated by the falling edge of INT0 pin input
when “0” is set to b7 of PUM or the rising edge of INT0 pin input
when “1” is set to the b7 of PUM.
Also, the INT0 interrupt occurs when the trigger is input from the
INT0 pin by setting the INT0 interrupt edge selection bit (b0) of the
interrupt edge selection register (INTEDGE) and the INT0 inter-
rupt enable bit (b2) of the interrupt control register 1 (ICON1). Even
when the trigger by the INT0 pin input is selected, the one-shot
pulse can be output by writing to b0 of ONS.
Also, in this mode, the waveform output interval of the one-shot
pulse can be extended for 0.5 cycle of timer count source clock by
setting the timer Z primary waveform extension control bit (b2) to
“1”. As a result, the waveforms of more accurate resolution can be
output.
When using the programmable wait one-shot generation mode,
note the following;
Notes on using the programmable wait one-shot generation mode
When setting and changing TZP, TZS, EXPZP and EXPZS, write
to TZP at last because the setting to them is executed all at once
by writing to TZP. Even when TZP is not changed, write the same
value. The value is reloaded to timer at the beginning of the next
primary interval.
Set by software in order not to execute the writing to timer Z pri-
mary and the timing of timer underflow simultaneously. When read-
ing the timer Z secondary, the undefined value is read out. How-
ever, while timer counts the setting value of the timer Z secondary,
the count values at the secondary interval can be identified by
reading the timer Z primary.
In this mode, set port P0
2
which is also used as TZ
OUT
pin to output.
B2 of PUM can be used only when “00
16
” is set to prescaler Z and
f(X
IN
)/2 or f(X
IN
)/16 is selected as the timer Z count source.
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