TMP88CS43FG datasheet(80/218 Pages) TOSHIBA

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Page 70

8. 16-Bit TimerCounter 1 (TC1)

8.3 Function

TMP88CS43FG

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 register 1A (TC1DRA) value is detected, an INTTC1 interrupt is generated and the up-counter is

cleared. After being cleared, the up-counter restarts counting. Setting TC1CR<ACAP1> to “1” captures the up-

counter value into the timer register 1B (TC1DRB) with the auto-capture function. Use the auto-capture

function in the operative condition of TC1. A captured 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.

Table 8-1

Source Clock for TimerCounter 1 (Example: fc = 20 MHz)

TC1CK

NORMAL, IDLE Mode

DV1CK = 0

DV1CK = 1

Resolution

[

µs]

Maximum Time

Setting [s]

Resolution

[

µs]

Maximum Time

Setting [s]

102.4

6.7108

204.8

13.4216

6.4

0.4194

12.8

0.8388

0.5

26.214 m

0.8

52.428 m

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

(fc

= 20 MHz, CGCR<DV1CK> = “0”)

LDW

(TC1DRA), 2625H

; Sets the timer register (1 s

÷ 211/fc = 2625H)

; IMF

= “0”

SET

(EIRD). 2

; Enables INTTC1

; IMF

= “1”

(TC1CR), 00000000B

; Selects the source clock and mode

(TC1CR), 00010000B

; Starts TC1

Example 2 :Auto-capture

(TC1CR), 01010000B

; ACAP1

← 1

; Wait at least one cycle of the internal source clock

WA, (TC1DRB)

; Reads the capture value

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