M306V2EEFS datasheet(91/271 Pages) RENESAS

91 / 271 page

Rev.1.40

Oct 06, 2004 page 91 of 269

M306V2ME-XXXFP, M306V2EEFP

2.10.2 Timer B

Figure 2.10.17 shows the block diagram of timer B. Figures 2.10.17 and 2.10.20 show the timer B-related

registers.

Use the timer Bi mode register (i = 0 to 2) bits 0 and 1 to choose the desired mode.

Timer B has three operation modes listed as follows:

• Timer mode: The timer counts an internal count source.

• Event counter mode: The timer counts pulses from an external source or a timer overflow.

• Pulse period/pulse width measuring mode: The timer measures an external signal’s pulse period or

pulse width.

Figure 2.10.16 Block diagram of timer B

Figure 2.10.17 Timer Bi mode register (i = 0 to 2)

Timer Bi mode register

Symbol

Address

When reset

TBiMR(i = 0 to 2) 039B16 to 039D16

00?X00002

Bit name

Function

Bit symbol

b7b6

0 0 : Timer mode

0 1 : Event counter mode

1 0 : Pulse period/pulse width

measurement mode

1 1 : Inhibited

b1 b0

TCK1

MR3

MR2

MR1

TMOD1

MR0

TMOD0

TCK0

Function varies with each operation mode

Count source select bit

(Function varies with each operation mode)

Operation mode select bit

(Note 1)

(Note 2)

Notes 1: Timer B0.

2: Timer B1, timer B2.

Clock source selection

(address 038016)

• Event counter

• Timer

• Pulse period/pulse width measurement

Reload register (16)

Low-order 8 bits

High-order 8 bits

Data bus low-order bits

Data bus high-order bits

f32

TBj overflow

(j = i – 1.

Note, however,

j = 2 when i = 0)

Can be selected in only

event counter mode

Count start flag

fC32

Polarity switching

and edge pulse

TBiIN

(i = 0 to 2)

Counter reset circuit

Counter (16)

TBi

Address

TBj

Timer B0

039116 039016

Timer B2

Timer B1

039316 039216

Timer B0

Timer B2

039516 039416

Timer B1

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