參數(shù)資料
型號(hào)： M38073E4-XXXFP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80
封裝： 0.80 MM PITCH, PLASTIC, QFP-80
文件頁(yè)數(shù)： 24/74頁(yè)
文件大小： 1182K
代理商： M38073E4-XXXFP
30
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3807 Group
qReal time output port
The 3807 group has two on-chip sets of real time output ports (RTP).
The two sets of real time output ports consist of two 16-bit timers A
and B and eight 8-bit real time port registers. Synchronous to the
reloading of timers A and B, the real time port register values are
output from ports P82 to P87, P30 and P31. The real time port regis-
ters consist of 8-bit register 0 to 7. Each port with its corresponding
bits is shown in figure 26.
Timer A and timer B have each two 16-bit timer latches. Figure 26
shows the real time port block diagram and figure 27 and 28 show
the structure of the real time port control registers 0 to 3.
There are four operating modes for real time ports which are:
8 repeated load mode, 6 repeated load mode, 5 repeated load mode
and one-shot pulse generating mode. Each operating mode can be
set for timer A and timer B separately. However, switch modes dur-
ing timer count stop.
(1) 8 repeated load mode
The output operation for each value of the real time port registers 7
to 0 is performed repeatedly in association with an alternate underflow
of the corresponding timer latch 1 or 0. The real time port output
pointer changes in sequence as a cycle of 8 repeated load opera-
tions as "7, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, 4, 3, 2, 1, 0, 7, 6, 5, ...."
The initial value at the generation of a start trigger can be specified
by setting a value in the output pointer. Figure 29 shows a timing
chart of 8 repeated load mode.
(2) 6 repeated load mode
The output operation for each value of real time port registers 5 to 0
is performed repeatedly in association with an alternate underflow of
the corresponding timer latch 1 to 0. The real time port output pointer
changes in sequence as a cycle of 6 repeated load operations as "5,
4, 3, 2, 1, 0, 5, 4, 3, 2, 1, 0, 5, 4, ...."
The initial value at the generation of a start trigger can be specified
by setting a value in the output pointer. Figure 30 shows a timing
chart of the 6 repeated load mode.
(3) 5 repeated load mode
The output operation for each value of real time port registers 4 to 0
is performed repeatedly in association with an alternate underflow of
the corresponding timer latch 1 or 0. The real time port output pointer
changes in sequence as a cycle of 5 repeated load operations as "4,
3, 2, 1, 0, 4, 3, 2, 1, 0, 4, 3, 2, 1, ...." The initial value at the generation
of a start trigger can be specified by setting a value in the output
pointer. Figure 31 shows a timing chart of the 5 repeated load mode.
(4) One-shot pulse generation mode
The output operation for each value of real time port registers 2 to 0
is performed only once in association with trigger generation and an
underflow of timer latch 1 or 0. After a trigger is generated, the value
of real time port register 1 is output from the real time output port and
the output pointer value becomes "0002". At each underflow of the
timer, the each value of real time port registers 0 and 2 is output in
ascending sequence, then the operation is completed.
After completion of the operation, the value of real time port register
2 is continuously output from the real time output port and the output
pointer value continues to be "0012" until the next start trigger is
generated. In this condition, the real time port function is in the wait
status.
When this mode is selected, the pointer value is not changed by
writing a value into the output pointer. If external trigger is specified
as trigger selection when this mode is selected, a rising and falling
double edge trigger is generated regardless of the contents of the
INT4 interrupt source bit (b7) of the interrupt edge selection register.
Figure 32 shows a timing chart of the one-shot pulse generation mode.
(5) Selection of timer interrupt mode
The timer is a count-down system. The contents of the timer latch
are reloaded by the count pulse subsequent to the moment when the
contents of the counter becomes "000016". At the same time, the
interrupt request bit corresponding to each timer is set to "1." The
interrupt request corresponding to the value of the real time port
output pointer can also be controlled. For controlling the interrupt
request bit, refer to the item pertaining to the timer interrupt mode
selection bit of the real time port control register 1,2 shown in figure
27 and 28.
(6) Switch of timer count source
The timer A and the timer B can select the system clock
φ divided by
2 or 16 as a count source with the timer A, B count source selection
bit (b0) of real time port control register 0.
[Timer latches]
Each of the timer A and the timer B has two 16-bit timer latches. Data
is written into the 8 low-order bits and the 8 high-order bits in this
order. When the high-order side has been written, the next latch is
automatically specified. The writing pointer changes in sequence as
"1, 0, 1, 0, 1, ...." The timer latch to be written first can be specified by
setting the timer writing pointer. Data is not written directly into the
timer A and the timer B. When reading the contents of the timer, the
count value at that point of time is read. Read the high-order side first
and then the low-order side. The low-order side value is read with
the same timing as that for the high-order side value and held at the
timer read latch. The data held state is released by reading the low-
order side. At a reload operation of the timer A or the timer B. Timer
latch 1 is reloaded as the initial value after a trigger is generated.
After that, the timer latch is reloaded in sequence as "0, 1, 0, 1, ...."
The timer latch value cannot be read out.
[Start trigger]
The operation of the real time port is started by a start trigger. When
a start trigger is generated, the value of the real time port register
specified by the output pointer (the value of real time port register 1
in the one-shot pulse generation mode) is output from the real time
output port.
The value of timer latch 1 is reloaded into the timer A or the timer B
and the timer count A, B source stop bit is released, so that the timer
count is started.
After that, when the timer underflows, data is transferred from the
real port register to the real time output port.
As a start trigger, either internal trigger or external trigger can be
selected by the timer A start trigger selection bit (b2) or timer B start
trigger selection bit (b5) of real time port control register 0.
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