M306V2EEFS datasheet(93/271 Pages) RENESAS

93 / 271 page

Rev.1.40

Oct 06, 2004 page 93 of 269

M306V2ME-XXXFP, M306V2EEFP

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 2.10.5) Figure 2.10.21

shows the timer Bi mode register in timer mode.

Table 2.10.5 Timer specifications in timer mode

Figure 2.10.21 Timer Bi mode register in timer mode (i = 0 to 2)

Notes 1: Timer B0.

2: Timer B1, timer B2.

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i=0 to 2)

039B16 to 039D16

00?X00002

Bit name

Function

Bit symbol

b7b6b5b4b3b2b1b0

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

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.

0 (Fixed to “0” in timer mode ; i = 0)

Nothing is assigned (i = 1, 2).

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

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