7547 datasheet(28/91 Pages) RENESAS

28 / 91 page

7547 Group

Rev.1.21

Nov 15, 2006

page 28 of 89

REJ03B0156-0121

Fig. 24 Block diagram of timer A and timer B

Timer A (low-order) latch (8)

Timer A (low-order) (8)

Timer A (high-order) latch (8)

Timer A (high-order) (8)

Data bus

Timer A interrupt

request

Compare

Capture

Timer B (low-order) latch (8)

Timer B (low-order) (8)

Timer B (high-order) latch (8)

Timer B (high-order) (8)

Data bus

Timer B interrupt

request

Compare

Capture

1/2

1/16

1/32

1/64

1/128

1/256

Timer A count

stop bit

Timer A

count source

selection bits

On-chip

oscillator

Timer A write

control bit

Timer B write

control bit

1/2

1/16

1/32

1/64

1/128

1/256

Timer B count

stop bit

Timer B count source

selection bits

Frequency

divider

On-chip

oscillator

XIN

“00”

“01”

“11”

Clock division

ratio selection

bits

“10”

Frequency

divider

CPU mode register

Fig. 22 Structure of timer A, B mode register

Fig. 23 Timer count source set register

Timer A, B mode register

(TABM : address 001D16, initial value: 0016)

Timer A write control bit

0 : Write to latch and timer simultaneously

1 : Write to only latch

Timer A count stop bit

0 : Count start

1 : Count stop

Timer B write control bit

0 : Write to latch and timer simultaneously

1 : Write to only latch

Timer B count stop bit

0 : Count start

1 : Count stop

Not used (return “0” when read)

Compare 0, 1 modulation mode bit

0: Disabled

1: Enabled

Compare 2, 3 modulation mode bit

0: Disabled

1: Enabled

Timer X count source selection bits

b1 b0

0 : f(XIN)/16

1 : f(XIN)/2

0 : f(XIN) (Note 1)

1 : Not available

Notes 1: f(XIN) can be used as timer X count source when using

a ceramic resonator or on-chip oscillator.

Do not use it at RC oscillation.

2: On-chip oscillator can be used when the on-chip oscillator

is enabled by bit 3 of CPUM.

Timer count source set register

(TCSS : address 002A16, initial value: 0016)

Timer B count source selection bits

b7 b6 b5

0 : f(XIN)/16

1 : f(XIN)/2

0 : f(XIN)/32

1 : f(XIN)/64

0 : f(XIN)/128

1 : f(XIN)/256

0 : Timer A underflow

1 : Not available

Timer A count source selection bits

b4 b3 b2

0 : f(XIN)/16

1 : f(XIN)/2

0 : f(XIN)/32

1 : f(XIN)/64

0 : f(XIN)/128

1 : f(XIN)/256

0 : On-chip oscillator output (Note 2)

1 : Not available

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