M16CSLASH62M datasheet(103/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer A

1-84

Item

Specification

Count source

• External signals input to TAiIN pin (effective edge can be selected by software)

• TB2 overflow, TAj overflow

Count operation

• Up count or down count can be selected by external signal or software

• When the timer overflows or underflows, it reloads the reload register con

tents before continuing counting (Note)

Divide ratio

1/ (FFFF16 - n + 1) for up count

1/ (n + 1) for down count

n : Set value

Count start condition

Count start flag is set (= 1)

Count stop condition

Count start flag is reset (= 0)

Interrupt request generation timing The timer overflows or underflows

TAiIN pin function

Programmable I/O port or count source input

TAiOUT pin function

Programmable I/O port, pulse output, or up/down count select input

Read from timer

Count value can be read out by reading timer Ai register

Write to timer

• When counting stopped

When a value is written to timer Ai register, it is written to both reload register and counter

• When counting in progress

When a value is written to timer Ai register, it is written to only reload register

(Transferred to counter at next reload time)

Select function

• Free-run count function

Even when the timer overflows or underflows, the reload register content is not reloaded to it

• Pulse output function

Each time the timer overflows or underflows, the TAiOUT pin’s polarity is reversed

Note: This does not apply when the free-run function is selected.

(2) Event counter mode

In this mode, the timer counts an external signal or an internal timer’s overflow. Timers A0 and A1 can

count a single-phase external signal. Timers A2, A3, and A4 can count a single-phase and a two-phase

external signal. Table 1.14.2 lists timer specifications when counting a single-phase external signal.

Figure 1.14.8 shows the timer Ai mode register in event counter mode.

Table 1.14.3 lists timer specifications when counting a two-phase external signal. Figure 1.14.9 shows

the timer Ai mode register in event counter mode.

Table 1.14.2. Timer specifications in event counter mode (when not processing two-phase pulse signal)

Figure 1.14.8. Timer Ai mode register in event counter mode

Note 1: In event counter mode, the count source is selected by the event / trigger select bit

(addresses 038216 and 038316).

Note 2: The settings of the corresponding port register and port direction register are invalid.

Note 3: Valid only when counting an external signal.

Note 4: When an “L” signal is input to the TAiOUT pin, the downcount is activated. When “H”,

the upcount is activated. Set the corresponding port direction register to “0”.

Symbol

Address

When reset

TAiMR(i = 0 to 4) 039616 to 039A16

0016

Operation mode select bit

0 1 : Event counter mode (Note 1)

b1 b0

TMOD0

MR0

Pulse output function

select bit

0 : Pulse is not output

(TAiOUT pin is a normal port pin)

1 : Pulse is output (Note 2)

(TAiOUT pin is a pulse output pin)

Count polarity

select bit (Note 3)

MR2

MR1

MR3

0 (Must always be “0” in event counter mode)

TCK0

Count operation type

select bit

0 : Counts external signal's falling edge

1 : Counts external signal's rising edge

Up/down switching

cause select bit

0 : Up/down flag's content

1 : TAiOUT pin's input signal (Note 4)

0 : Reload type

1 : Free-run type

Bit symbol

Bit name

Function

TCK1

Invalid when not using two-phase pulse signal processing

Can be “0” or “1”

TMOD1

Timer Ai mode register

(When not using two-phase pulse signal processing)

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