M16CSLASH29 datasheet(143/499 Pages) RENESAS

143 / 499 page

12. Timer B

page 119

Item

Specification

Count source

f1, f2, f8, f32, fC32

Count operation

• Decrement

• When the timer underflows, it reloads the reload register contents and

continues counting

Divide ratio

1/(n+1)

n: set value of TBi register (i= 0 to 2)

000016 to FFFF16

Count start condition

Set TBiS bit(1) to 1 (start counting)

Count stop condition

Set TBiS bit to 0 (stop counting)

Interrupt request generation timing Timer underflow

TBiIN pin function

I/O port

Read from timer

Count value can be read by reading TBi register

Write to timer

• When not counting and until the 1st count source is input after counting start

Value written to TBi register is written to both reload register and counter

• When counting (after 1st count source input)

Value written to TBi register is written to only reload register

(Transferred to counter when reloaded next)

NOTE:

1. Bits TB0S to TB2S are assigned to the bit 7 to bit 5 in the TABSR register.

12.2.1 Timer Mode

In timer mode, the timer counts a count source generated internally (see Table 12.6). Figure 12.18

shows TBiMR register in timer mode.

Table 12.6 Specifications in Timer Mode

Figure 12.18 TBiMR Register in Timer Mode

Timer Bi Mode Register (i= 0 to 2)

Symbol

Address

After Reset

TB0MR to TB2MR

039B16 to 039D16

00XX00002

Bit Name

Function

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

Operation mode select bit

0 0: Timer mode or A/D trigger mode

b1 b0

TMOD1

TMOD0

MR0

No effect in timer mode

Can be set to 0 or 1

MR2

MR1

MR3

0 0: f1 or f2

0 1: f8

1 0: f32

1 1: fC32

TCK1

TCK0

Count source select bit

TB0MR register

Set to 0 in timer mode

b7 b6

TB1MR, TB2MR registers

Nothing is assigned. If necessary, set to 0. When read, its

content is undefined

When write in timer mode, set to 0. When read in timer mode, its

content is undefined

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