M16623MA datasheet(83/242 Pages) RENESAS

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Timer B

Mitsubishi microcomputers

M16C / 62A Group (80-pin)

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Item

Specification

Count source

f1, f8, f32, fC32

Count operation

• Counts down

• 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

The timer underflows

TBiIN pin function

Programmable I/O port

Read from timer

Count value is read out by reading timer Bi register

Write to timer

• When counting stopped

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

• When counting in progress

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

(Transferred to counter at next reload time)

(1) Timer mode

In this mode, the timer counts an internally generated count source. (See Table 1.13.6.) Figure 1.13.17

shows the timer Bi mode register in timer mode.

Table 1.13.6. Timer specifications in timer mode

Note 1: Timer B0, timer B3.

Note 2: Timer B1, timer B2, timer B4, timer B5.

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i=0 to 5)

039B16 to 039D16

00XX00002

035B16 to 035D16

00XX00002

Bit name

Function

Bit symbol

Operation mode select bit

0 0 : Timer mode

b1 b0

TMOD1

TMOD0

MR0

Invalid in timer mode

Can be “0” or “1”

MR2

MR1

MR3

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : fC32

TCK1

TCK0

Count source select bit

0 (Must always be “0” in timer mode ; i = 0, 3)

Nothing is assiigned (i = 1, 2, 4, 5).

In an attempt to write to this bit, write “0”. The value, if read, turns out

to be indeterminate.

(Note 1)

(Note 2)

b7 b6

Invalid in timer mode.

In an attempt to write to this bit, write “0”. The value, if read in

timer mode, turns out to be indeterminate.

Figure 1.13.17. Timer Bi mode register in timer mode

Note: Timer B1 works exclusively as an internal timer since timer B1 does not have input port (TB1IN).

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