M16CSLASH29 datasheet(141/499 Pages) RENESAS

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12. Timer B

page 117

12.2 Timer B

Figure 12.15

shows a block diagram of the timer B. Figures 12.16 and 12.17 show registers related to the

timer B.

Timer B supports the following four modes. Use bits TMOD1 and TMOD0 in the TBiMR register (i = 0 to 2)

to select the desired mode.

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

• Event counter mode: The timer counts the external pulses or overflows and underflows of other timers.

• Pulse period/pulse width measurement mode: The timer measures the pulse period or pulse width of

external signal.

• A/D trigger mode: The timer starts counting by one trigger until the count value becomes 000016.

This mode is used together with simultaneous sample sweep mode or delayed trigger mode 0 of A/D

converter to start A/D conversion.

Figure 12.15 Timer B Block Diagram

Figure 12.16 TB0MR to TB2MR Registers

Clock source selection

• Event counter

Reload register

Low-order 8 bits

High-order 8 bits

Data bus low-order bits

Data bus high-order bits

TABSR register

Polarity switching,

edge pulse

Counter reset circuit

Counter

Clock selection

• Timer mode

• Pulse period/, pulse width measuring mode

• A/D trigger mode

f1 or f2

fC32

f32

TBj overflow (1)

(j = i – 1, except j = 2 if i = 0)

Can be selected in

onlyevent counter mode

TBiIN

(i = 0 to 2)

NOTE:

1. Overflow or underflow.

TBi

Address

TBj

Timer B0

039116 - 039016

Timer B2

Timer B1

039316 - 039216

Timer B0

Timer B2

039516 - 039416

Timer B1

Timer Bi Mode Register (i=0 to 2)

Symbol

After Reset

TB0MR to TB2MR

Bit Name

Function

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

b1 b0

TCK1

MR3

MR2

MR1

TMOD1

MR0

TMOD0

TCK0

Operation mode select bit

(1)

(2)

NOTES:

1. Timer B0.

2. Timer B1, Timer B2.

Function varies with each operation

mode

Count source select bit

Function varies with each operation

mode

Address

039B16 to 039D16

00XX00002

0 0 : Timer mode or A/D trigger mode

0 1 : Event counter mode

1 0 : Pulse period measurement mode,

pulse width measurement mode

1 1 : Do not set

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