TMP93CS44 datasheet(99/224 Pages) TOSHIBA

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TMP93CS44/S45

2004-02-10

93CS44-97

(4) 8-bit PWM Output mode

This mode is valid only for timer 2. In this mode, maximum 8-bit resolution of PWM

pulse can be output.

PWM pulse is output to TO3 pin (also used as P41) when using timer 2. Timer 3 can

also be used as 8-bit timer.

Timer output is inverted when up counter (UC2) matches the set value of timer

− 1 (n = 6, 7 or 8; specified by T32MOD<PWM21:20>)

counter overflow occurs. Up counter UC0 is cleared when 2n

− 1 counter overflow

occurs.

To use this PWM mode, the following conditions must be satisfied.

(Set value of timer register)

< (Set value of 2n − 1 counter overflow)

(Set value of timer register)

≠ 0

Figure 3.7.16 8-Bit PWM Waveforms

Figure 3.7.17 shows the block diagram of this mode.

Figure 3.7.17 Block Diagram of 8-Bit PWM Mode

TREG2 and

UC2 match

TO3

tPWM

(PWM cycle)

− 1

Overflow

(Interrupt INTT2)

Selector

8-bit up counter

(UC2)

Comparator

φT1

φT4

φT16

T32MOD<T2CLK1:0>

TFF3

TREG2

Selector

TRDC<TR2DE>

TREG2-WR

TRUN<T2RUN>

TO3

TFFCR

<TFF3C1:0,

TFF3IE>

Shift trigger

Internal data bus

Clear

− 1

overflow

control

INTT2

T32MOD

<T32M1:0>

= 11

T32MOD

<PWM21:20>

Overflow

Invert

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