參數(shù)資料
型號(hào): M37510E2156FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁數(shù): 16/43頁
文件大?。?/td> 614K
代理商: M37510E2156FP
16
7510 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Timer Y
Timer Y is a 16-bit timer that can be selected in one of four modes.
Timer mode
The timer counts f(X
IN
)/16 (or f(X
CIN
)/16, if the selected system
clock
φ
is f(X
CIN
)/2).
Period measurement mode
CNTR
1
interrupt request is generated at rising/falling edge of
CNTR
1
pin input signal. Simultaneously, the value in timer Y latch
is reloaded in timer Y and timer Y continues counting down. Except
for the above-mentioned, the operation in period measurement
mode is the same as in timer mode.
The timer value just before the reloading at rising/falling of CNTR
1
pin input signal is retained until the timer Y is read once after the
reload.
The rising/falling timing of CNTR
1
pin input signal is found by
CNTR
1
interrupt.
Event counter mode
The timer counts signals input through the CNTR
1
pin. Except for
this, the operation in event counter mode is the same as in timer
mode.
Pulse width HL continuously measurement mode
CNTR
1
interrupt request is generated at both rising and falling
edges of CNTR
1
pin input signal. Except for this, the operation in
pulse width HL continuously measurement mode is the same as in
period measurement mode.
Note on CNTR
1
Interrupt Active Edge
Selection
CNTR
1
interrupt active edge depends on the CNTR
1
active edge
selection bit. However, in pulse width HL continuously measure-
ment mode, CNTR
1
interrupt request is generated at both rising
and falling edges of CNTR
1
pin input signal regardless of the set-
ting of CNTR
1
active edge selection bit.
Fig. 11 Structure of timer Y mode register
Not used (return “0” when read)
Timer Y operation mode bits
b5 b4
0 0 : Timer mode
0 1 : Period measurement mode
1 0 : Event counter mode
1 1 : Pulse width HL continuously
measurement mode
CNTR
1
active edge selection bit
0 : Count at rising edge in event counter mode
Measure the falling edge to falling edge
period in period measurement mode
Falling edge active for CNTR
1
interrupt
1 : Count at falling edge in event counter mode
Measure the rising edge to rising edge
period in period measurement mode
Rising edge active for CNTR
1
interrupt
Timer Y stop control bit
0 : Count start
1 : Count stop
b7
Timer Y mode register
(TYM : address 0028
16
)
b0
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