M16CSLASH26 datasheet(94/239 Pages) RENESAS

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Renesas Technology Corp.

Timer B

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Timer B

Figure 1.13.16 shows the block diagram of timer B. Figures 1.13.17 and 1.13.18 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 1.13.16. Block diagram of timer B

Figure 1.13.17. Timer B-related registers (1)

Timer Bi mode register

Symbol

Address

When reset

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

00XX00002

Bit name

Function

Bit symbol

0 0 : Timer mode

0 1 : Event counter mode

1 0 : Pulse period/pulse width

measurement mode

1 1 : Must not be set.

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)

Note 1: Timer B0.

Note 2: Timer B1, timer B2.

f1 or f2

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

Clock selection

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