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参数资料
| 型号： | M37640E8FP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 24/96页 |
| 文件大小： | 1477K |
| 代理商： | M37640E8FP |
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30
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.17 TIMERS
This device has five built-in timers: Timer X, Timer Y,
Timer 1, Timer 2, and Timer 3.
The contents of the timer latch, corresponding to
each timer, determine the divide ratio. The timers can
be read or written at any time. However, the read and
write operations on the high and low-order bytes of
the 16-bit timers (Timer X and Y) must be performed
in a specific order.
The timers are all down count timers; when the count
of a timer reaches 0016 (000016 for Timer X and Y),
an underflow occurs at the next count pulse and the
contents of the corresponding timer reload latch are
reloaded into the timer. When a timer underflows, the
interrupt request bit corresponding to that timer is set
to a “1”.
The divide ratio of a timer is given by 1/(n + 1), where
n is the value written to the timer. When the STP in-
struction is executed or RESET is asserted, 0116 is
loaded into Timer 2 and the Timer 2 reload latch, and
FF16 is loaded into Timer 1 and the Timer 1 reload
latch.
Figure 1.32 is a block diagram of the five timers.
Fig. 1.32. Block diagram of Timers X, Y, 1, 2, and 3
Timer X Divider
(1/
n)
Timer Y Divider
(1/
n)
n=8, 16, 32, 64
SCSGCLK
TXM2,1
TYM3,2
Φ
1/8
Timer XL Latch(8)
Timer XL (8)
Timer XH Latch(8)
Timer XH (8)
TXM0
Timer X Interrupt Request
CNTR0 Interrupt Request
10
00
01
TXM7
TXM5,4
11
TXM6
TXM3
1
0
1
TXM6
TXM5, 4 = 01
0
1
Q
T
TXM5,4= 01
Rising Edge Detector
TYM5,4= 11
TYM5,4= 01
or
11
Timer YL Latch(8)
Timer YL (8)
Timer YH Latch(8)
Timer YH (8)
TYM0
TYM7
TYM5,4
00
01
11
10
0
TYM6
TYM= 1 & TYM5, 4 = 00
1
TYM6
0
1
Q
T
TYM1= 11 and TYM5,4 = 0
00
01
10
S
TYM5,4
11
Timer Y Interrupt Request
CNTR1 Interrupt Request
0
1
T123M5
T123M6= 1
Timer 2 Latch(8)
Timer 2 (8)
T123M7
Timer 2
Timer 3 Latch(8)
Timer3 (8)
Timer 3
1
Timer 1 Latch(8)
Timer 1 (8)
T123M7
T123M3
T123M4
1
0
Q
T
S
TOUT
CNTR1
CNTR0
Falling Edge Detector
Interrupt Request
XCin/2
T123M2
0
1
0
T123M1
Timer 1
Interrupt Request
0
1
T123M6 =1
Q
T
S
T123M5
1
0
T123M0
Φ
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