M16CSLASH62M datasheet(102/615 Pages) RENESAS

102 / 615 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer A

1-83

Item

Specification

Count source

f1, f8, f32, fC32

Count operation

• Down count

• When the timer underflows, it reloads the reload register contents before continuing counting

Divide ratio

1/(n+1)

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

When the timer underflows

TAiIN pin function

Programmable I/O port or gate input

TAiOUT pin function

Programmable I/O port or pulse output

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

• Gate function

Counting can be started and stopped by the TAiIN pin’s input signal

• Pulse output function

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

(1) Timer mode

In this mode, the timer counts an internally generated count source. (See Table 1.14.1.) Figure 1.14.7

shows the timer Ai mode register in timer mode.

Table 1.14.1. Specifications of timer mode

Note 1: The settings of the corresponding port register and port direction register

are invalid.

Note 2: The bit can be “0” or “1”.

Note 3: Set the corresponding port direction register to “0”.

Timer Ai mode register

Symbol

Address

When reset

TAiMR(i=0 to 4)

039616 to 039A16

0016

Bit name

Function

Bit symbol

Operation mode

select bit

0 0 : Timer mode

b1 b0

TMOD1

TMOD0

MR0

Pulse output function

select bit

0 : Pulse is not output

(TAiOUT pin is a normal port pin)

1 : Pulse is output (Note 1)

(TAiOUT pin is a pulse output pin)

Gate function select bit

0 X (Note 2): Gate function not available

(TAiIN pin is a normal port pin)

1 0 : Timer counts only when TAiIN pin is

held “L” (Note 3)

1 1 : Timer counts only when TAiIN pin is

held “H” (Note 3)

b4 b3

MR2

MR1

MR3

0 (Must always be “0” in timer mode)

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bit

Figure 1.14.7. Timer Ai mode register in timer mode

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