TMP86FS49AIUG datasheet(96/296 Pages) TOSHIBA

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Page 80

8. 16-Bit TimerCounter 1 (TC1)

8.3 Function

TMP86FS49AIUG

8.3

Function

TimerCounter 1 has six types of operating modes: timer, external trigger timer, event counter, window, pulse

width measurement, programmable pulse generator output modes.

8.3.1

Timer mode

In the timer mode, the up-counter counts up using the internal clock. When a match between the up-counter and the timer

cleared, the up-counter restarts counting. Setting TC1CR<ACAP1> to “1” captures the up-counter value into the timer reg-

ister 1B (TC1DRB) with the auto-capture function. Use the auto-capture function in the operative condition of TC1. A cap-

tured value may not be fixed if it's read after the execution of the timer stop or auto-capture disable. Read the capture value

in a capture enabled condition. Since the up-counter value is captured into TC1DRB by the source clock of up-counter after

setting TC1CR<ACAP1> to "1". Therefore, to read the captured value, wait at least one cycle of the internal source clock

before reading TC1DRB for the first time.

Note: Since the up-counter value is captured into TC1DRB by the source clock of up-counter after setting TC1CR<ACAP1> to "1".

Therefore, to read the captured value, wait at least one cycle of the internal source clock before reading TC1DRB for the first

time.

Table 8-1

Internal Source Clock for TimerCounter 1 (Example: fc

= 16 MHz, fs = 32.768 kHz)

TC1CK

NORMAL1/2, IDLE1/2 mode

SLOW, SLEEP mode

DV7CK = 0

DV7CK = 1

Resolution

[

µs]

Maximum Time Setting

[s]

Resolution

[

µs]

Maximum Time Setting

[s]

Resolution

[

µs]

Maximum

Time Set-

ting [s]

128

8.39

244.14

16.0

244.14

16.0

8.0

0.524

8.0

0.524

–

0.5

32.77 m

0.5

32.77 m

–

Example 1 :Setting the timer mode with source clock fc/211 [Hz] and generating an interrupt 1 second later

(fc

= 16 MHz, TBTCR<DV7CK> = “0”)

LDW

(TC1DRA), 1E84H

; Sets the timer register (1 s

÷ 211/fc = 1E84H)

; IMF

= “0”

SET

(EIRL). 5

; Enables INTTC1

; IMF

= “1”

(TC1CR), 00000000B

; Selects the source clock and mode

(TC1CR), 00010000B

; Starts TC1

Example 2 :Auto-capture

(TC1CR), 01010000B

; ACAP1

← 1

WA, (TC1DRB)

; Reads the capture value

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