120 PSoC 4000 Family: PSoC 4 Architecture TRM, Document No. 001-89309 Rev. *D
Timer, Counter, and PWM
Figure 16-15. Timing Diagram for PWM, with and without Dead Time
16.3.5.3 Configuring Counter for PWM with Dead Time Mode
The steps to configure the counter for PWM with Dead Time mode of operation and the affected register bits are as follows:
1. Disable the counter by writing '0' to the COUNTER_ENABLED field of the TCPWM_CTRL register.
2. Select PWM with Dead Time mode by writing '101' to the MODE[26:24] field of the TCPWM_CNT_CTRL register.
3. Set the required dead time by writing to the GENERIC[15:8] field of the TCPWM_CNT_CTRL register, as shown in
Table 16-1.
4. Set the required 16-bit period in the TCPWM_CNT_PERIOD register and the buffer period value in the
TCPWM_CNT_PERIOD_BUFF register to switch values, if required.
5. Set the 16-bit compare value in the TCPWM_CNT_CC register and the buffer compare value in the
TCPWM_CNT_CC_BUFF register to switch values, if required.
6. Set the direction of counting by writing to the UP_DOWN_MODE[17:16] field of the TCPWM_CNT_CTRL register to con-
figure left-aligned, right-aligned, or center-aligned PWM, as shown in Table 16-6.
7. Set the PWM_STOP_ON_KILL and PWM_SYNC_KILL fields of the TCPWM_CNT_CTRL register as required, as shown
in the “Pulse Width Modulation Mode” on page 115.
8. Set the TCPWM_CNT_TR_CTRL0 register to select the trigger that causes the event (Reload, Start, Kill, Switch, and
Count).
9. Set the TCPWM_CNT_TR_CTRL1 register to select the edge that causes the event (Reload, Start, Kill, Switch, and
Count).
10. dt_line and dt_line_compl can be controlled by the TCPWM_CNT_TR_CTRL2 register to set, reset, or invert upon CC,
OV, and UN conditions.
11. If required, set the interrupt upon TC or CC condition, as shown in “Interrupts” on page 104.
12. Enable the counter by writing '1' to the COUNTER_ENABLED field of the TCPWM_CTRL register. A start trigger must be
provided through firmware (TCPWM_CMD register) to start the counter if hardware start signal is not enabled.
PWM, Deadtime insertion
line_out
Dead time duration : 0
dt_line
dt_line_compl
Deadtime duration :
dt_line
dt_line_compl
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