TMP88CS38 datasheet(136/226 Pages) TOSHIBA

136 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-136

Binary Counter Control Register

CGCR

(00030H)

“0”

DV1CK

“0”

(Initial value: 0000 0000)

DV1CK

Select of input clock to

1st divider

fc/4

fc/8

R/W

Note 1:

*: Don’t care

Note 2:

The all bits except DV1CK are cleared to “0”.

Figure 2.13.5 DIVIDER Control Register

(1) Internal counter

The internal counter of PWM outputs is a free running counter. The all bits of

counter are set to “1” and are not counted up at one of the following conditions.

1. During reset

2. The operation mode is changed to STOP mode.

3. Setting ABORTx (x: 1, 2) to “1”.

4. The START3 to 0 are “0” in 12-bit PWM outputs. The START9 to 4 are “0” in 7-bit

PWM outputs.

5. The lower 8-bit of PWM data latch in 12-bit PWM outputs is “00H”. The PWM

data latch in 7-bit PWM outputs is “00H”.

(2) Outputs control and programming of PWM data

The PWM outputs are fixed to a high-level immediately when the ABORTx (x: 1, 2) is

set to “1”. The PWM outputs starts the operation when the STARTx (x: 0 to 9) is set to

“1”.

The data from the transfer buffer to a PWM data latch is transferred when the all bits of

internal counter are set to “1”. Therefore, the data is transferred to a PWM data latch

immediately when the internal counter is initialized. And the data is transferred to a PWM

data latch at the beginning of the next cycle when all bits of the internal counter are not set

to “1”.

The sequence of writing the output data to PWM data latches is shown as follows;

PWM0

to PWM1

a) Write the channel number of PWM data latch to PWMCHS1 (Bit2 and 1 in

PWMCR1B) and clear PWMHL (Bit0 in PWMCR1B) to “0”.

b) Write the lower 8-bit PWM output data to PWMDBR1.

c) Write the channel number of PWM data latch to PWMCHS1 and set PWMHL

to “1”.

d) Write the upper 4-bit or 6-bit PWM output data to PWMDBR1.

e) Select the resolution of PWM output to RESOLUTIONx (x: 0, 1) (Bit0 and 1 in

PWMCR1A) and set STARTx (x: 0, 1) (Bit2 and 3 in PWMCR1B) to “1”.

Note:

PWM output data must be write to PWMDBR1 in the order of the lower 8-bit

PWM output data, the upper 4-bit (or 6-bit) PWM output data. If the upper 4-bit

(or 6-bit) PWM output data is write to PWMDBR1, the lower 8-bit PWM output

data is not changed (except when lower 8-bit PWM output data is “00H”).

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