M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 134

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TIMER A
5.6 Pulse width modulation (PWM) mode
5–44
5.6.4 Operation in PWM mode
The following explains operation of the pulse width modulator.
[16-bit pulse width modulator]
[8-bit pulse width modulator]
When the 16/8-bit PWM mode select bit is set to “0,” the counter operates as a 16-bit pulse width
modulator. Figures 5.6.4 and 5.6.5 show operation examples of the 16-bit pulse width modulator.
When the 16/8-bit PWM mode select bit is set to “1,” the counter is divided into 8-bit halves. Then, the
high-order 8 bits operate as an 8-bit pulse width modulator, and the low-order 8 bits operate as an 8-bit
prescaler. Figures 5.6.6 and 5.6.7 show operation examples of the 8-bit pulse width modulator.
Each time a PWM pulse has been output for one period, the reload register’s contents are reloaded and
When the PWM mode is selected with the operating mode select bits, the TAi
The timer Ai interrupt request bit is set to “1” each time the PWM pulse level goes from “H” to “L.”
When a trigger is generated, the counter (pulse width modulator) starts counting and the TAi
outputs a PWM pulse (Notes 1 and 2).
The interrupt request bit remains set to “1” until the interrupt request is accepted or the interrupt request
bit is cleared to “0” by software.
the counter continues counting.
Notes 1: If a value “0000
2: When the counter operates as an 8-bit pulse width modulator, the TAi
width modulator, the pulse width modulator does not operate and the output from the TAi
pin remains “L” level. The timer Ai interrupt request does not occur. Similarly, if a value “00
is set into the high-order 8 bits of the timer Ai register when the counter operates as an 8-
bit pulse width modulator, the same is performed.
of the PWM pulse which has the same width as set “H” level of the PWM pulse after a trigger
generated. After that, the PWM pulse output starts from the TAi
16
” is set into the timer Ai register when the counter operates as a 16-bit pulse
7702/7703 Group User’s Manual
OUT
OUT
OUT
pin.
pin outputs “L” level.
pin outputs “L” level
OUT
pin
OUT
16
”