TMP86CS49FG datasheet(92/252 Pages) TOSHIBA

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Page 78

8. 16-Bit TimerCounter 1 (TC1)

8.2 TimerCounter Control

TMP86CS49FG

8.2 TimerCounter Control

The TimerCounter 1 is controlled by the TimerCounter 1 control register (TC1CR) and two 16-bit timer registers

(TC1DRA and TC1DRB).

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

Note 2: The timer register consists of two shift registers. A value set in the timer register becomes valid at the rising edge of the

first source clock pulse that occurs after the upper byte (TC1DRAH and TC1DRBH) is written. Therefore, write the lower

byte and the upper byte in this order (it is recommended to write the register with a 16-bit access instruction). Writing only

the lower byte (TC1DRAL and TC1DRBL) does not enable the setting of the timer register.

Note 3: To set the mode, source clock, PPG output control and timer F/F control, write to TC1CR during TC1S=00. Set the timer F/

F1 control until the first timer start after setting the PPG mode.

Timer Register

98765

43210

TC1DRA

(0011H, 0010H)

TC1DRAH (0011H)

TC1DRAL (0010H)

(Initial value: 1111 1111 1111 1111)

Read/Write

TC1DRB

(0013H, 0012H)

TC1DRBH (0013H)

TC1DRBL (0012H)

(Initial value: 1111 1111 1111 1111)

Read/Write (Write enabled only in the PPG output mode)

TimerCounter 1 Control Register

TC1CR

(0026H)

543

TFF1

ACAP1

MCAP1

METT1

MPPG1

TC1S

TC1CK

TC1M

Read/Write

(Initial value: 0000 0000)

TFF1

Timer F/F1 control

0: Clear

1: Set

R/W

ACAP1

Auto capture control

0:Auto-capture disable

1:Auto-capture enable

R/W

MCAP1

Pulse width measure-

ment mode control

0:Double edge capture

1:Single edge capture

METT1

External trigger timer

mode control

0:Trigger start

1:Trigger start and stop

MPPG1

PPG output control

0:Continuous pulse generation

1:One-shot

TC1S

TC1 start control

Timer

Extrig-

ger

Event

Win-

dow

Pulse

PPG

R/W

00: Stop and counter clear

OOOOOO

01: Command start

––––

10: Rising edge start

(Ex-trigger/Pulse/PPG)

Rising edge count (Event)

Positive logic count (Window)

–

OOOOO

11: Falling edge start

(Ex-trigger/Pulse/PPG)

Falling edge count (Event)

Negative logic count (Window)

–

OOOOO

TC1CK

TC1 source clock select

[Hz]

NORMAL1/2, IDLE1/2 mode

Divider

SLOW,

SLEEP

mode

R/W

DV7CK = 0

DV7CK = 1

fc/211

fs/23

DV9

fs/23

fc/27

DV5

–

fc/23

DV1

–

External clock (TC1 pin input)

TC1M

TC1 operating mode

select

00: Timer/external trigger timer/event counter mode

01: Window mode

10: Pulse width measurement mode

11: PPG (Programmable pulse generate) output mode

R/W

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