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參數(shù)資料
| 型號(hào)： | M37630E4FS |
| 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)： | 19/48頁 |
| 文件大小： | 563K |
| 代理商： | M37630E4FS |
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MITSUBISHI MICROCOMPUTERS
7630 Group
19
MITSUBISHI
ELECTRIC
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
TIMERS
The 7630 group has five timers: two 16-bit timers and three 8-bit
timers . All these timers will be described in detail below.
16-bit Timers
Timers X and Y are 16-bit timers with multiple operating modes.
Please refer to Fig. 17.
Fig. 17
Block diagram of timers X and Y (
φ
is internal system clock)
Timer X
Timer X is a 16-bit timer with a 16-bit reload latch supporting the fol-
lowing operating modes:
(1) Timer mode
(2) Bi-phase counter mode
(3) Event counter mode
(4) Pulse width measurement mode
These modes can be selected by the timer X mode register (TXM).
In the timer- and pulse width measurement mode, the timer’s count
source can be selected by the timer X count source selection bits of
the timer Y mode register (TYM). Please refer to the Figures below
for the TXM and TYM bit assignment.
On read or write access to timer X, note that the high-order and low-
order bytes must be accessed in the specific order.
Write method
When writing to the timer X, write the low-order byte first. The data
written is stored in a temporary register which is assigned to the
same address as TX
L
. Next, write the high-order byte. When this is
finished, the data is placed in the timer X high-order reload latch
and the low-order byte is transferred from its temporary register to
the timer X low-order reload latch. Depending on the timer X write
control bit, the latch contents are reloaded to the timer immediately
(write control bit = “0”) or on the next timer underflow (write control
bit = “1”).
Read method
When reading the timer X, read the high-order byte first. This
causes the timer X high- and low-order bytes to be transferred to
temporary registers being assigned to the same addresses as TX
H
and TX
L
. Next, read the low-order byte which is read from the tem-
porary register. This method assures the correct timer value can be
read during the timer count operation.
Timer X count stop control
Regardless of the actual operating mode, timer X can be stopped
by setting the timer X count stop bit (bit 7 of the timer X mode regis-
ter) to “1”.
TYM
5, 4
=“11”
TYM
7
1/16
1/64
1/128
TYM
1,0
φ
P1
3
/TX
0
P1
4
/CNTR
0
edge detector
edge detector
sign generator
TX
L
counter (8)
TX
H
latch (8)
TX
H
counter (8)
TXM
7
TX
L
latch (8)
count
direction
control
down
TXM
5, 4
“00”, “10”,
“11”
“01”
“00”, “11”
“01”
“10”
TXM
6
TXM
5, 4
=“11”
TX interrupt request
CNTR0 interrupt request
1/8
1/32
1/64
P1
5
/CNTR
1
TYM
6
TYM
5, 4
“10”
“0x”, “11”
TY
L
counter (8)
TY
H
latch (8)
TY
H
counter (8)
TY
L
latch (8)
TY interrupt request
CNTR1 interrupt request
rising edge detector
falling edge detector
TYM
5, 4
=“01”
TYM
5, 4
“11”
“0x”,
“10”
“0”
“1”
TYM
3, 2
1/4
1/2
TXM
5,4
“00”
“01”
“10”
“11”
“00”
“01”
“10”
“11”
“0”
“1”
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| M37630M4T-XXXFS | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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