M34282M1-XXXGP View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M34282M1-XXXGP

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4282 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

(3) Timer 1

Timer 1 is an 8-bit binary down counter with the timer 1 reload

register (R1).

When timer is stopped, data can be set simultaneously in timer

1 and the reload register (R1) with the T1AB instruction.

When timer is operating, data can be set to only reload register

R1 with the T1AB instruction.

When setting the next count data to reload register R1 at

operating, set data before timer 1 underflows.

Timer 1 starts counting after the following process;

➀ set data in timer 1,

➁ select the count source with the bit 1 of register V1, and

➂ set the bit 0 of register V1 to “1.”

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 underflow flag (T1F) is set to “1,” new data is loaded

from reload register R1, and count continues (auto-reload

function).

When a value set in reload register R1 is n, timer 1 divides the

count source signal by n + 1 (n = 0 to 255).

When the bit 2 of register V1 is set to “1,” the carrier wave

output enable/disable interval of port CARR is alternately

generated each timer 1 underflows (Figure 14).

Data can be read from timer 1 to registers A and B. When

reading the data, stop the counter and then execute the TAB1

instruction.

(4) Timer 2

Timer 2 is an 8-bit binary down counter with the timer 2 reload

registers (R2H and R2L).

Data can be set simultaneously in timer 2 and the reload

register (R2L) with the T2AB instruction.

The contents of reload register (R2L) set with the T2AB

instruction can be set again to timer 2 with the T2R2L

instruction. Data can be set to reload register (R2H) with the

T2HAB instruction.

Timer 2 starts counting after the following process;

➀ set data in timer 2,

➁ select the count source with the bit 1 of register V2, and

➂ select the valid/invalid of the carrier wave generation

function by bit 2 of register V1 (when this function is valid,

select the valid/invalid of the carrier wave “H” interval

expansion by bit 3), and

➃ set the bit 0 of register V1 to “1.”

When the carrier wave generation function is invalid (V22=“0”),

the following operation is performed;

Once count is started, when timer 2 underflows (the next count

pulse is input after the contents of timer 2 becomes “0”), the

timer 2 underflow flag (T2F) is set to “1,” new data is loaded

from reload register R2L, and count continues (auto-reload

function).

When a value set in reload register R2L is n, timer 2 divides

the count source signal by n + 1 (n = 0 to 255).

When the carrier wave generation function is valid (V22=“1”),

the carrier wave which has the “L” interval set to the reload

register R2L and “H” interval set to the reload register R2H

can be output (Figure 15).

After the count of the “L” interval of carrier wave is started,

timer 2 underflows and the timer 2 underflow flag (T2F) is set

to “1”. Then, the “H” interval data of carrier wave is reloaded

from the reload register R2H, and count continues.

When timer underflows again after auto-reload, the T2F flag

is set to “1”. And then, the “L” interval data of carrier wave is

reloaded from the reload register R2L, and count continues.

After that, each timer underflows, data is reloaded from reload

register R2H and R2L alternately.

When a value set in reload register R2H is n, “H” interval of

carrier wave is as follows;

➀ When to expand “H” interval is invalid (V23 = “0”),

Count source ✕ (n+1), n = 0 to 255

➁ When to expand “H” interval is valid (V23 = “1”),

Count source ✕ (n+1.5), n = 1 to 255

When a value set in reload register R2L is m, “L” interval of

carrier wave is as follows;

Count source ✕ (m+1), m = 0 to 255

Data can be read from timer 2 to registers A and B. When

reading the data, stop the counter and then execute the TAB2

instruction.

(5) Timer underflow flags (T1F, T2F)

Timer 1 underflow flag or timer 2 underflow flag is set to “1”

when the timer 1 or timer 2 underflows. The state of flags T1F

and T2F can be examined with the skip instruction (SNZT1,

SNZT2).

Flags T1F and T2F are cleared to “0” when the next instruction

is skipped with a skip instruction.

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