TMP93CS44 datasheet(111/224 Pages) TOSHIBA

111 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-109

1. Prescaler

There are 9-bit prescaler and prescaler clock selection registers to generate input

clock for 8-bit timer 0, 1, 2, 3, 16-bit timer 4, 5 and serial interface 0, 1.

Figure 3.8.9 shows the block diagram. Table 3.8.1 shows prescaler clock resolution

into 8, 16-bit Timer.

Figure 3.8.9 The Block Diagram of Prescaler

Table 3.8.1 Prescaler Clock Resolution to 8-Bit Timer and 16-Bit Timer

at fc

= 20 MHz, fs = 32.768 kHz

Prescaler Clock Resolution

Select System

Clock

<SYSCK>

Select Prescaler

Clock

<PRCK1:0>

Gear Value

<GEAR2:0>

φT1

φT4

φT16

φT256

1 (fs)

XXX

fs/2

3 (244

µs) fs/25 (977 µs) fs/27 (3.9 ms)

fs/2

11 (62.5 ms)

000 (fc)

fc/2

3 (0.4

µs)

fc/2

5 (1.6

µs)

fc/2

7 (6.4

µs)

fc/2

11 (102.4

µs)

001 (fc/2)

fc/2

4 (0.8

µs)

fc/2

6 (3.2

µs)

fc/2

8 (12.8

µs)

fc/2

12 (204.8

µs)

010 (fc/4)

fc/2

5 (1.6

µs)

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs)

fc/2

13 (409.6

µs)

011 (fc/8)

fc/2

6 (3.2

µs)

fc/2

8 (12.8

µs) fc/210(51.2 µs)

fc/2

14(819.2

µs)

0 (fc)

00 (fFPH)

100 (fc/16)

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs) fc/211(102.4 µs) fc/215(1.6384 ms)

XXX

(Low-frequency

clock)

XXX

fs/2

3 (244

µs) fs/25 (977 µs) fs/27 (3.9 ms)

fs/2

11 (62.5 ms)

XXX

(Note)

(fc/16 clock)

XXX

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs) fc/211(102.4 µs) fc/215(1.6384 ms)

XXX: Don’t care

Note: The fc/16 clock as a prescaler clock can not be used when the fs is used as a system clock.

512

256

128

φT1

φT4

φT16

φT256

φT1

φT4

φT16

φ1

φT0

φT2

φT8

φT32

÷2

÷4

÷16

÷8

÷4

÷2

to CPU

System clock fSYS

9-bit prescaler

To 8-bit timer

0, 1, 2, 3

fc/16

fc/8

fc/4

fc/2

SYSCR1<GEAR2:0>

TRUN<PRRUN>

SYSCR0

<PRCK1:0>

Run/stop

and clear

To 16-bit timer

4, 5

To serial

interface

0, 1

fFPH

XT1

SYSCR1<SYSCK>

16-bit timer

8-bit timer

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