TMP86CS49FG datasheet(116/252 Pages) TOSHIBA

116 / 252 page

Page 102

10. 8-Bit TimerCounter (TC3, TC4)

10.1 Configuration

TMP86CS49FG

The TimerCounter 4 is controlled by the TimerCounter 4 control register (TC4CR) and two 8-bit timer registers

(TTREG4 and PWREG4).

Note 1: Do not change the timer register (TTREG4) setting while the timer is running.

Note 2: Do not change the timer register (PWREG4) 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 TC4M, TC4CK and TFF4 settings while the timer is running.

Note 3: To stop the timer operation (TC4S= 1

→ 0), do not change the TC4M, TC4CK and TFF4 settings.

To start the timer operation (TC4S= 0

→ 1), TC4M, TC4CK and TFF4 can be programmed.

Note 4: When TC4M= 1** (upper byte in the 16-bit mode), the source clock becomes the TC3 overflow signal regardless of the

TC4CK setting.

Note 5: To use the TimerCounter in the 16-bit mode, select the operating mode by programming TC4M, where TC3CR<TC3M>

must be set to 011.

TimerCounter 4 Timer Register

TTREG4

(0015H)

R/W

6543

210

(Initial value: 1111 1111)

PWREG4

(0019H)

R/W

6543

210

(Initial value: 1111 1111)

TimerCounter 4 Control Register

TC4CR

(0028H)

6543

210

TFF4

TC4CK

TC4S

TC4M

(Initial value: 0000 0000)

TFF4

Timer F/F4 control

Clear

Set

R/W

TC4CK

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

–

111

TC4 pin input

TC4S

TC4 start control

Operation stop and counter clear

Operation start

R/W

TC4M

TC4M operating mode select

000:

001:

010:

011:

100:

101:

110:

111:

8-bit timer/event counter mode

8-bit programmable divider output (PDO) mode

8-bit pulse width modulation (PWM) output mode

Reserved

16-bit timer/event counter mode

Warm-up counter mode

16-bit pulse width modulation (PWM) output mode

16-bit PPG mode

R/W

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