TMP93CS41 datasheet(119/248 Pages) TOSHIBA

119 / 248 page

TMP93CS40/TMP93CS41

2004-02-10

93CS40-117

1. Prescaler

There are 5-bit prescaler and prescaler clock selection registers to generate clock inputs

for 8-bit PWM timers 0 and 1.

Figure 3.8.3 shows the block diagram. Table 3.8.1 shows prescaler clock resolution into

8-bit PWM timers 0 and 1.

Figure 3.8.3 Block Diagram of the Prescaler

Table 3.8.1 Prescaler Clock Resolution to 8-Bit PWM Timers 0 and 1

at fc

= 20 MHz, fs = 32.768 kHz

Prescaler Clock Resolution

Select System

Clock

<SYSCK>

Select Prescaler

Clock

<PRCK1:0>

Gear Value

<GEAR2:0>

φP1

φP4

φP16

1 (fs)

XXX

fs/2

2 (122

µs)

fs/2

4 (488

µs)

fs/2

6 (1.95 ms)

000 (fc)

fc/2

2 (0.2

µs)

fc/2

4 (0.8

µs)

fc/2

6 (3.2

µs)

001 (fc/2)

fc/2

3 (0.4

µs)

fc/2

5 (1.6

µs)

fc/2

7 (6.4

µs)

010 (fc/4)

fc/2

4 (0.8

µs)

fc/2

6 (3.2

µs)

fc/2

8 (12.8

µs)

011 (fc/8)

fc/2

5 (1.6

µs)

fc/2

7 (6.4

µs)

fc/2

9 (25.6

µs)

0 (fc)

(fFPH)

100 (fc/16)

fc/2

6 (3.2

µs)

fc/2

8 (12.8

µs)

fc/2

10 (51.2

µs)

XXX

(Low-frequency

clock)

XXX

fs/2

2 (122

µs)

fs/2

4 (488

µs)

fs/2

6 (1.95 ms)

XXX

(fc/16 clock)

XXX

fc/2

6 (3.2

µs)

fc/2

8 (12.8

µs)

fc/2

10 (51.2

µs)

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.

To 8-bit PWM timers 0

and 1

5-bit prescaler

XT1

To 9-bit prescaler for 8-bit timers 0 and 1, 16-bit timers/event counters

4 and 5, and serial interfaces 0 and 1.

φP16

φP4

φP1

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>

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