M16CSLASH1N datasheet(87/238 Pages) RENESAS

87 / 238 page

Rev.1.00

Oct 20, 2004

page 75 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

Item

Specification

Count source

f1, f8, f32, fC32

Count operation

• Down count

• When the timer underflows, it reloads the reload register contents before continuing

counting

Divide ratio

n: Set value of Prescaler X, m: Set value of Timer X

Count start condition

Count start flag is set (=1)

Count stop condition

Count start flag is reset (=0)

Interrupt request generation timing When Timer X underflows [Timer X interruption]

CNTR0 pin function

Programmable I/O port or CNTR0 interrupt input pin

TXOUT pin function

Programmable I/O port

Read from timer

Count value can be read out by reading Timer X register.

Same applies to Prescaler X register.

Write to timer

When a value is written to Timer X register, it is written to both reload register and counter.

Same applies to Prescaler X register.

Table 12.3 Specifications of timer mode

b5 b4

Timer X mode register

TXMOD0

TXMOD1

Operation mode

select bit 0, 1

(Note 1)

R0EDG

CNTR0 polarity

switching bit (Note 1)

TXS

Timer X count

start flag

P30/TXOUT

select bit

Operation mode

select bit 2

0 : Stops counting

1 : Starts counting

0 : Rising edge

1 : Falling edge

TXOCNT

0 : In timer mode, set to "0"

TXMOD2

0 : In timer mode, set to "0"

TXEDG

Effectual edge

reception flag

TXUND

Timer X under

flow flag

Invalid in timer mode.

When write, set "0". When read, this contents

is indeterminate.

Invalid in timer mode.

When write, set "0". When read, this contents

is indeterminate.

Symbol

TXMR

Address

008B16

When reset

0016

Function

Bit name

Bit symbol

b1 b0

0 0 : Timer mode

Note 1: This bit should rewrite with inhibiting the CNTR0 interrupt. When using the interrupt, the interrupt must be enabled

after clearing the CNTR0 interrupt request bit to "0" using a MOV instruction.

(n+1) X (m+1)

Figure 12.6 Timer X mode register in timer mode

12.2.1 Timer Mode

In this mode, the timer counts an internally generated count source.

(See Table 12.3) Figure 12.6 shows the Timer X mode register in timer mode.

M16C/1N датащи(PDF) 87 Page - Renesas Technology Corp

M16C/1N датащи(HTML) 87 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

датащи скачать

ссылки URL