TMP86FS28DFG datasheet(124/272 Pages) TOSHIBA

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Page 112

9. 8-Bit TimerCounter (TC3, TC4)

9.1 Configuration

TMP86FS28DFG

9.2 TimerCounter Control

The TimerCounter 3 is controlled by the TimerCounter 3 control register (TC3CR) and two 8-bit timer registers

(TTREG3, PWREG3).

Note 1: Do not change the timer register (TTREG3) setting while the timer is running.

Note 2: Do not change the timer register (PWREG3) setting in the operating mode except the 8-bit and 16-bit PWM modes while

the timer is running.

Note 1: fc: High-frequency clock [Hz] fs: Low-frequency clock[Hz]

Note 2: Do not change the TC3M, TC3CK and TFF3 settings while the timer is running.

Note 3: To stop the timer operation (TC3S= 1

→ 0), do not change the TC3M, TC3CK and TFF3 settings. To start the timer opera-

tion (TC3S= 0

→ 1), TC3M, TC3CK and TFF3 can be programmed.

Note 4: To use the TimerCounter in the 16-bit mode, set the operating mode by programming TC4CR<TC4M>, where TC3M must

be fixed to 011.

Note 5: To use the TimerCounter in the 16-bit mode, select the source clock by programming TC3CK. Set the timer start control

and timer F/F control by programming TC4CR<TC4S> and TC4CR<TFF4>, respectively.

Note 6: The operating clock settings are limited depending on the timer operating mode. For the detailed descriptions, see Table

9-1 and Table 9-2.

TimerCounter 3 Timer Register

TTREG3

(0015H)

R/W

6543

210

(Initial value: 1111 1111)

PWREG3

(0019H)

R/W

6543

210

(Initial value: 1111 1111)

TimerCounter 3 Control Register

TC3CR

(0009H)

6543

210

TFF3

TC3CK

TC3S

TC3M

(Initial value: 0000 0000)

TFF3

Time F/F3 control

Clear

Set

R/W

TC3CK

Operating clock selection [Hz]

NORMAL1/2, IDLE1/2 mode

SLOW1/2

SLEEP1/2

mode

R/W

DV7CK = 0

DV7CK = 1

000

fc/211

fs/23

001

fc/27

–

010

fc/25

–

011

fc/23

–

100

101

fc/2

–

110

fc (Note 8)

111

TC3 pin input

TC3S

TC3 start control

Operation stop and counter clear

Operation start

R/W

TC3M

TC3M operating mode select

000:

001:

010:

011:

1**:

8-bit timer/event counter mode

8-bit programmable divider output (PDO) mode

8-bit pulse width modulation (PWM) output mode

16-bit mode

(Each mode is selectable with TC4M.)

Reserved

R/W

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