TMP86CM74AFG Datasheet, PDF (88/182 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

8. 16-Bit TimerCounter 1 (TC1)
8.3 Function
TMP86CM74AFG
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 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.
Table 8-1 Internal Source Clock for TimerCounter 1 (Example: fc = 16 MHz, fs = 32.768 kHz)
TC1CK
00
01
10
DV7CK = 0
NORMAL1/2, IDLE1/2 mode
DV7CK = 1
SLOW, SLEEP mode
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)
DI
; IMF= “0”
SET
(EIRL). 5
; Enables INTTC1
EI
; IMF= “1”
LD
(TC1CR), 00000000B
; Selects the source clock and mode
LD
(TC1CR), 00010000B
; Starts TC1
Example 2 :Auto-capture
LD
(TC1CR), 01010000B
; ACAP1 ← 1
:
:
LD
WA, (TC1DRB)
; Reads the capture value
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.
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