Toshiba TLCS-870/C Series, Manual

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Page 106
10. 8-Bit TimerCounter (TC5, TC6)
10.1 Configuration
TMP86PM29BUG
10.3 Function
The TimerCounter 6 have the 8-bit timer, 8-bit event counter, 8-bit programmable divider output (PDO), 8-bit
pulse width modulation (PWM) output modes. The TimerCounter 5 and 6 (TC5, 6) are cascadable to form a 16-bit
timer. The 16-bit timer has the operating modes such as the 16-bit timer, 16-bit event counter, warm-up counter, 16-
bit pulse width modulation (PWM) output and 16-bit programmable pulse generation (PPG) modes.
10.3.1 8-Bit Timer Mode (TC5 and 6)
In the timer mode, the up-counter counts up using the internal clock. When a match between the up-counter
and the timer register j (TTREGj) value is detected, an INTTCj interrupt is generated and the up-counter is
cleared. After being cleared, the up-counter restarts counting.
Note 1: In the timer mode, fix TCjCR<TFFj> to 0. If not fixed, the
PDOj
,
PWMj
and
PPGj
pins may output pulses.
Note 2: In the timer mode, do not change the TTREGj setting while the timer is running. Since TTREGj is not in the
shift register configuration in the timer mode, the new value programmed in TTREGj is in effect immediately
after the programming. Therefore, if TTREGi is changed while the timer is running, an expected operation
may not be obtained.
Note 3: j = 5, 6
Table 10-4 Source Clock for TimerCounter 5, 6 (Internal Clock)
Source Clock Resolution Maximum Time Setting
NORMAL1/2, IDLE1/2 mode SLOW1/2,
SLEEP1/2
mode
fc = 16 MHz fs = 32.768 kHz fc = 16 MHz fs = 32.768 kHz
DV7CK = 0 DV7CK = 1
fc/2
11
[Hz] fs/2
3
[Hz] fs/2
3
[Hz]
128
µ
s 244.14
µ
s 32.6 ms 62.3 ms
fc/2
7
fc/2
7
– 8
µ
s – 2.0 ms –
fc/2
5
fc/2
5
– 2
µ
s – 510
µ
s –
fc/2
3
fc/2
3
– 500 ns – 127.5
µ
s –
Example :Setting the timer mode with source clock fc/2
7
Hz and generating an interrupt 80
µ
s later
(TimerCounter6, fc = 16.0 MHz)
LD (TTREG6), 0AH
: Sets the timer register (80
µ
s
÷
2
7
/fc = 0AH).
DI
SET (EIRH). 4 : Enables INTTC6 interrupt.
EI
LD (TC6CR), 00010000B
: Sets the operating clock to fc/2
7
, and 8-bit timer mode.
LD (TC6CR), 00011000B : Starts TC6.