參數(shù)資料
型號(hào)： MB90F423GA
廠商： Fujitsu Limited
英文描述： Octal Transparent D-type Latches With 3-State Outputs 20-CFP -55 to 125
中文描述： 16位微控制器原件
文件頁數(shù)： 39/99頁
文件大?。?/td> 1706K
代理商： MB90F423GA
MB90420G/5G (A) Series
39
4.
16-bit Reload Timer
The 16-bit reload timer can either count down in synchronization with three types of internal clock signals in
internal clock mode, or count down at the detection of the designated edge of an external signal. The user may
select either function. This timer defines a transition from 0000
H
to FFFF
H
as an underflow event. Thus an
underflow occurs when counting from the value [Reload register setting
+
1].
A selection of two counter operating modes are available. In reload mode, the counter is reset to the count value
and continues counting after an underflow, and in one-shot mode the count stops after an underflow. The counter
can generate an interrupt when an underflow occurs, and is compatible with the expanded intelligent I/O services
(EI
2
OS) .
(1) 16-bit Reload timer operating modes
Clock mode
(2) Internal clock mode
One of three input clocks is selected as the count clock, and can be used in one of the following operations.
Soft trigger operation
When “1” is written to the TRG bit in the timer control status register (TMCSR0/1) , the count operation
starts.Trigger input at the TRG bit is normally valid with an external trigger input, as well as an external gate
input.
External trigger operation
Count operation starts when a selected edge (rising, falling, both edges) is input at the TIN0/1 pin.
External gate input operation
Counting continues as long as the selected signal level (“L” or “H”) is input at the TIN0/1 pin.
(3) Event count mode (External clock mode)
In this mode a down count event occurs when a selected valid edge (rising, falling, both edges) is input at the
TIN0/1 pin. This function can also be used as an interval timer when an external clock with a fixed period is used.
(4) Counter operation
Reload mode
In down count operation, when an underflow event (transition from “0000
H
” to “FFFF
H
”) occurs, the set count
value is reloaded and count operation continues. The function can be used as an interval timer by generating
an interrupt request at each underflow event. Also, a toggle waveform that inverts at each underflow can be
output from the TOT0/1 pin.
Counter clock
Counter clock period
2
1
/
φ
(0.125
μ
s)
2
3
/
φ
(0.5
μ
s)
2
5
/
φ
(2.0
μ
s)
External clock
2
3
/
φ
or greater (0.5
μ
s)
φ
: Machine clock cycle. Figures in ( ) are values at machine clock frequency 16 MHz.
Counter mode
16-bit reload timer operation
Internal clock mode
Reload mode
Soft trigger operation
External trigger operation
External gate input operation
One-shot mode
Event count mode
(external clock mode)
Reload mode
Soft trigger operation
One-shot mode
Interval time
0.125
μ
s to 8.192 ms
0.5
μ
s to 32.768 ms
2.0
μ
s to 131.1 ms
0.5
μ
s or greater
Internal clock
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