Renesas PCA4738F-80A Bedienungsanleitung PDF herunterladen (Seite 23)

22

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

Timer A underflow

interrupt request

Timer A (high-order) (8)

Timer A (low-order) (8)

Timer A (high-order) latch (8)

Timer A (low-order) latch (8)

Timer A

operating

mode bits

Timer A write control bit

Data bus

X

IN

1/1

1/2

1/4

Timer A count

source selection bit

1/8

Output selection bit

P5

0

latch

TA

OUT

active

edge switch bit

P5

0

/TA

OUT

P5

0

direction

register

S

“0”

“1”

Q

Q

D

Compare register (high-order) (8)

Compare register (low-order) (8)

1/2

1/4

Divider

Noise filter sampling

clock selection bit

INT

0

0µs

Delay circuit

External trigger delay

time selection bit

4/f(X

IN

)

TA

OUT

output

control bit 1

TA

OUT

output

control bit 2

“0”

“1”

“0”

“1”

“10”

R

Timer A start

signal

INT

1

INT

2

“

00

”

“

01

”

“

10

”

“

11

”

Internal trigger start

“00”, “01”, “11”

“10”

Match

“00”, “01”, “11”

Timer A operating

mode bits

TA

OUT

active

edge switch bit

S

“0”

“1”

Q

Q

T

S

Pulse output mode

IGBT output mode

PWM mode

8/f(X

IN

)

16/f(X

IN

)

Note: The initial value of M version becomes “1” (output).

(Note)

Noise filter

(4-time same levels judgement)

Divider

Fig. 19 Block diagram of timer A

Fig. 20 Structure of timer A related registers

b7 b0

Timer A control register

(TACON : address 0031

16)

Noise filter sampling clock selection bit

0 : f(X

IN)/2

1 : f(X

IN)/4

External trigger delay time selection bits

0 0 : No delay

0 1 : ( 4/f(X

IN))µs

1 0 : ( 8/f(X

IN))µs

1 1 : (16/f(X

IN))µs

Timer A output control bit 1 (P5

6)

0 : Not used

1 : INT1 interrupt used

Timer A output control bit 2 (P5

7)

0 : Not used

1 : INT2 interrupt used

Not used (returns “0” when read)

b7 b0

Timer A mode register

(TAM : address 0030

16)

Timer A operating mode bits

00 : Timer mode

01 : Pulse output mode

10 : IGBT output mode

11 : PWM mode

Timer A write control bit

0 : Write data to both timer latch and timer

1 : Write data to timer latch onl

y

Timer A count source selection bits

0 0 : f(X

IN)

0 1 : f(X

IN)/2

1 0 : f(X

IN)/4

1 1 : f(X

IN)/8

Timer A output active edge switch bit

0 : Output starts with “L” level

1 : Output starts with “H” level

Timer A count stop bit

0 : Count operating

1 : Count stop

Timer A output selection bit (P5

0)

0 : I/O port

1 : Timer A output

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