TMP93CS41 datasheet(100/248 Pages) TOSHIBA

100 / 248 page

TMP93CS40/TMP93CS41

20004-02-10

93CS40-98

1. Prescaler

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

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

Figure 3.7.2 shows the corresponding block diagram, and Table 3.7.1 shows prescaler

clock signal resolution into 8 and 16-bit timers.

Figure 3.7.2 Block Diagram of the Prescaler

Table 3.7.1 Prescaler Clock Resolution to 8 and 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

(244

µs)

fs/2

(977

µs)

fs/2

(3.9 ms)

fs/2

11 (62.5 ms)

000 (fc)

fc/2

(0.4

µs)

fc/2

(1.6

µs)

fc/2

(6.4

µs)

fc/2

11 (102.4

µs)

001 (fc/2)

fc/2

(0.8

µs)

fc/2

(3.2

µs)

fc/2

(12.8

µs)

fc/2

12 (204.8

µs)

010 (fc/4)

fc/2

(1.6

µs)

fc/2

(6.4

µs)

fc/2

(25.6

µs)

fc/2

13 (409.6

µs)

011(fc/8)

fc/2

(3.2

µs)

fc/2

(12.8

µs)

fc/2

(51.2

µs)

fc/2

14 (0.82 ms)

0 (fc)

(fFPH)

100 (fc/16)

fc/2

(6.4

µs)

fc/2

(25.6

µs)

fc/2

(102.4

µs)

fc/2

15 (1.64 ms)

XXX

(Low-frequency clock)

XXX

fs/2

(244

µs)

fs/2

(977

µs)

fs/2

(3.9 ms)

fs/2

11 (62.5 ms)

XXX

10 (Note)

(fc/16 clock)

XXX

fc/2

(6.4

µs)

fc/2

(25.6

µs)

fc/2

(102.4

µs)

fc/2

15 (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

XT1

÷4

÷2

÷16

÷8

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

SYSCR1<GEAR2:0>

SYSCR1<SYSCK>

TRUN<PRRUN>

Run/stop

and clear

SYSCR0

<PRCK1:0>

fFPH

To CPU

System clock (fSYS)

To 5-bit prescaler

32 64 128 256 512

To 8-bit timers 0 and 1

φT1

φT4

φT16

φT256

9-bit prescaler

φT1

φT4

φT16

To 16-bit timers 4 and 5

φ1

φT0

φT2

φT8

φT32

To serial interfaces 0

and 1

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