UPD78F1502AGK-GAK-AX Datasheet, PDF (270/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 6 TIMER ARRAY UNIT
6.1.2 Functions of each channel when it operates with another channel
Combination operation functions are those functions that are attained by using the master channel (mostly the
reference timer that controls cycles) and the slave channels (timers that operate following the master channel) in
combination (for details, refer to 6.6.1 Overview of single-operation function and combination operation function).
(1) PWM (Pulse Width Modulator) output
Two channels are used as a set to generate a pulse with a specified period and a specified duty factor.
(2) One-shot pulse output
Two channels are used as a set to generate a one-shot pulse with a specified delay time and a specified pulse
width.
(3) Multiple PWM (Pulse Width Modulator) output
By extending the PWM function and using one master channel and two or more slave channels, up to seven types
of PWM signals that have a specific period and a specified duty factor can be generated.
6.1.3 LIN-bus supporting function (channel 7 of timer array unit 0 only)
(1) Detection of wakeup signal
The timer starts counting at the falling edge of a signal input to the serial data input pin (RxD3) of UART3 and the
count value of the timer is captured at the rising edge. In this way, a low-level width can be measured. If the low-
level width is greater than a specific value, it is recognized as a wakeup signal.
(2) Detection of sync break field
The timer starts counting at the falling edge of a signal input to the serial data input pin (RxD3) of UART3 after a
wakeup signal is detected, and the count value of the timer is captured at the rising edge. In this way, a low-level
width is measured. If the low-level width is greater than a specific value, it is recognized as a sync break field.
(3) Measurement of pulse width of sync field
After a sync break field is detected, the low-level width and high-level width of the signal input to the serial data
input pin (RxD3) of UART3 are measured. From the bit interval of the sync field measured in this way, a baud rate
is calculated.
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Jun 20, 2011