參數(shù)資料
型號(hào): M37702M2AXXXFP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 15/59頁
文件大小: 811K
代理商: M37702M2AXXXFP
15
MITSUBISHI MICROCOMPUTERS
M37702M2AXXXFP, M37702M2BXXXFP
M37702S1AFP, M37702S1BFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
TIMER
There are eight 16-bit timers. They are divided by type into timer A
(5) and timer B (3).
The timer I/O pins are shared with I/O pins for port P5 and P6. To
use these pins as timer input pins, the data direction register bit
corresponding to the pin must be cleared to “0” to specify input
mode.
TIMER A
Figure 11 shows a block diagram of timer A.
Timer A has four modes; timer mode, event counter mode, one-
shot pulse mode, and pulse width modulation mode. The mode is
selected with bits 0 and 1 of the timer Ai mode register (i = 0 to 4).
Each of these modes is described below.
(1) Timer mode [00]
Figure 12 shows the bit configuration of the timer Ai mode register
during timer mode. Bits 0, 1, and 5 of the timer Ai mode register
must always be “0” in timer mode.
Bit 3 is ignored if bit 4 is “0”.
Bits 6 and 7 are used to select the timer counter source.
The counting of the selected clock starts when the count start flag
is “1” and stops when it is “0”.
Figure 13 shows the bit configuration of the count start flag. The
counter is decremented, an interrupt is caused and the interrupt
request bit in the timer Ai interrupt control register is set when the
contents becomes 0000
16
. At the same time, the contents of the
reload register is transferred to the counter and count is contin-
ued.
Fig. 11 Block diagram of timer A
Data bus (odd)
Data bus (even)
Count start flag
(40
16
)
Down count
Up-down flag
(44
16
)
(Higher 8 bits)
Counter(16)
Up/Down
Always decremented
except in event count mode
Polarity
selection
Timer (gate function)
TAi
IN
(i = 0 – 4)
f
2
f
16
f
64
f
512
Clock source selection
Timer
One-shot
Pulse width modulation
Event counter
External trigger
Timer A0 47
16
46
16
Timer A1 49
16
48
16
Timer A2 4B
16
4A
16
Timer A3 4D
16
4C
16
Timer A4 4F
16
4E
16
Addresses
(Lower 8 bits)
Pulse output
TAi
OUT
(i = 0 – 4)
Reload register(16)
Toggle flip-flop
1/2
1/8
1/2
1/2
1/8
f
2
f
16
f
32
f
64
f
512
f(X
IN
)
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