TMP93CS41 datasheet(143/248 Pages) TOSHIBA

143 / 248 page

TMP93CS40/TMP93CS41

2004-02-10

93CS40-141

1. Prescaler

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

signals for 8-bit timers 0 and 1, 16-bit timers 4 and 5, and serial interfaces 0 and 1.

Figure 3.9.11 shows the block diagram. Table 3.9.1 shows prescaler clock resolution into

8-/16-bit timers.

Figure 3.9.11 Block Diagram of Prescaler

Table 3.9.1 Prescaler Clock Resolution into 8-/16-Bit Timers

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/2

5 (977

µs)

fs/2

7 (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/2

10 (51.2

µs) fc/214 (819.2 ms)

0 (fc)

(fFPH)

100 (fc/16)

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs)

fc/2

11 (102.4

µs) fc/215 (1.64 ms)

XXX

(Low-frequency clock)

XXX

fs/2

3 (244

µs)

fs/2

5 (977

µs)

fs/2

7 (3.9 ms)

fs/2

11 (62.5 ms)

XXX

(fc/16 clock)

XXX

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs)

fc/2

11 (102.4

µs) fc/215 (1.64 ms)

XXX: Don’t care

Note: The fc/16 clock cannot be used as a prescaler

clock when the fs is used as a system clock.

16-bit timer

8-bit timer

To 8-bit timers 0 and

9-bit prescaler

XT1

φT1

φT4

φT16

φT256

fFPH

To CPU

÷4 ÷8 ÷16

÷2

SYSCR1<GEAR2:0>

SYSCR1<SYSCK>

fc/2 fc/4 fc/8 fc/16

SYSCR0

<PRCK1:0>

Run/stop

& clear

TRUN<PRRUN>

2 4

128

256 512

φT1

φT4

φT16

To 16-bit timers 4 and

φ1

φT0

φT2

φT8

φT32

To serial interfaces

0 and 1

To 8-bit PWM prescaler

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