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參數(shù)資料
| 型號(hào)： | M34554MC-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64 |
| 文件頁(yè)數(shù)： | 69/137頁(yè) |
| 文件大?。?/td> | 1606K |
| 代理商： | M34554MC-XXXFP |
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37
4554 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
(1) Timer control registers
Timer control register PA
Register PA controls the count operation of prescaler. Set the
contents of this register through register A with the TPAA instruc-
tion.
Timer control register W1
Register W1 controls the selection of timer 1 count auto-stop cir-
cuit, and the count operation and count source of timer 1. Set the
contents of this register through register A with the TW1A instruc-
tion. The TAW1 instruction can be used to transfer the contents
of register W1 to register A.
Timer control register W2
Register W2 controls the selection of CNTR0 output, and the
count operation and count source of timer 2. Set the contents of
this register through register A with the TW2A instruction. The
TAW2 instruction can be used to transfer the contents of register
W2 to register A.
Timer control register W3
Register W3 controls the selection of timer 3 count auto-stop cir-
cuit, and the count operation and count source of timer 3. Set the
contents of this register through register A with the TW3A instruc-
tion. The TAW3 instruction can be used to transfer the contents
of register W3 to register A.
Timer control register W4
Register W4 controls the CNTR1 output, the expansion of “H” in-
terval of PWM output, and the count operation and count source
of timer 4. Set the contents of this register through register A with
the TW4A instruction. The TAW4 instruction can be used to trans-
fer the contents of register W4 to register A.
Timer control register W5
Register W5 controls the count operation and count source of
timer 5. Set the contents of this register through register A with
the TW5A instruction. The TAW5 instruction can be used to trans-
fer the contents of register W5 to register A.
Timer control register W6
Register W6 controls the operation and count source of timer LC,
the selection of CNTR1 output auto-control circuit and the D7/
CNTR0 pin function. Set the contents of this register through reg-
ister A with the TW6A instruction. The TAW6 instruction can be
used to transfer the contents of register W6 to register A..
(2) Prescaler (interrupt function)
Prescaler is an 8-bit binary down counter with the prescaler reload
register PRS. Data can be set simultaneously in prescaler and the
reload register RPS with the TPSAB instruction. Data can be read
from reload register RPS with the TABPS instruction.
Stop counting and then execute the TPSAB or TABPS instruction
to read or set prescaler data.
Prescaler starts counting after the following process;
set data in prescaler, and
set the bit 0 of register PA to “1.”
When a value set in reload register RPS is n, prescaler divides the
count source signal by n + 1 (n = 0 to 255).
Count source for prescaler is the instruction clock (INSTCK).
Once count is started, when prescaler underflows (the next count
pulse is input after the contents of prescaler becomes “0”), new
data is loaded from reload register RPS, and count continues
(auto-reload function).
The output signal (ORCLK) of prescaler can be used for timer 1, 2,
3, 4 and LC count sources.
(3) Timer 1 (interrupt function)
Timer 1 is an 8-bit binary down counter with the timer 1 reload reg-
ister (R1). Data can be set simultaneously in timer 1 and the reload
register (R1) with the T1AB instruction. Data can be written to re-
load register (R1) with the TR1AB instruction. Data can be read
from timer 1 with the TAB1 instruction.
Stop counting and then execute the T1AB or TAB1 instruction to
read or set timer 1 data.
When executing the TR1AB instruction to set data to reload regis-
ter R1 while timer 1 is operating, avoid a timing when timer 1
underflows.
Timer 1 starts counting after the following process;
set data in timer 1
set count source by bits 0 and 1 of register W1, and
set the bit 2 of register W1 to “1.”
When a value set in reload register R1 is n, timer 1 divides the
count source signal by n + 1 (n = 0 to 255).
Once count is started, when timer 1 underflows (the next count
pulse is input after the contents of timer 1 becomes “0”), the timer
1 interrupt request flag (T1F) is set to “1,” new data is loaded from
reload register R1, and count continues (auto-reload function).
INT0 pin input can be used as the start trigger for timer 1 count op-
eration by setting the bit 0 of register I1 to “1.”
Also, in this time, the auto-stop function by timer 1 underflow can
be performed by setting the bit 3 of register W1 to “1.”
Timer 1 underflow signal divided by 2 can be output from CNTR0
pin by clearing bit 3 of register W2 to “0” and setting bit 0 of regis-
ter W6 to “1”.
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