M306V2EEFS datasheet(94/271 Pages) RENESAS

94 / 271 page

Rev.1.40

Oct 06, 2004 page 94 of 269

M306V2ME-XXXFP, M306V2EEFP

Item

Specification

Count source

• External signals input to TBiIN pin

• Effective edge of count source can be a rising edge, a falling edge, or falling and

rising edges as selected by software

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

Count source input

Read from timer

Count value can be 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)

Table 2.10.6 Timer specifications in event counter mode

Figure 2.10.22 Timer Bi mode register in event counter mode (i = 0 to 2)

(2) Event counter mode

In this mode, the timer counts an external signal or an internal timer’s overflow. (See Table 2.10.6) Figure

2.10.22 shows the timer Bi mode register in event counter mode.

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i=0 to 2)

039B16 to 039D16

00?X00002

Bit nameFunction

Bit symbol

b7b6b5b4b3

b2b1b0

Operation mode select bit

0 1 : Event counter mode

b1 b0

TMOD1

TMOD0

MR0

Count polarity select

bit (Note 1)

MR2

MR1

MR3

TCK1

TCK0

0 0 : Counts external signal's falling

edges

0 1 : Counts external signal's rising

edges

1 0 : Counts external signal's falling

and rising edges

1 1 : Inhibited

b3 b2

Notes 1: Valid only when input from the TBiIN pin is selected as the event clock.

If timer's overflow is selected, this bit can be “0” or “1”.

2: Timer B0.

3: Timer B1, timer B2.

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

Invalid in event counter mode.

Can be “0” or “1”.

Event clock select

0 : Input from TBiIN pin (Note 4)

1 : TBj overflow

(j = i – 1; however, j = 2 when i = 0)

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

(Note 2)

(Note 3)

Invalid in timer mode.

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

event counter mode, turns out to be indeterminate.

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.

M306V2EEFS 数据表(PDF) 94 Page - Renesas Technology Corp

M306V2EEFS 数据表(HTML) 94 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载