Section 11 14-Bit PWM Timer (PWMX)
Rev. 3.00 Jan 25, 2006 page 273 of 872
REJ09B0286-0300
Section 11 14-Bit PWM Timer (PWMX)
This LSI has an on-chip 14-bit pulse-width modulator (PWM) timer with two output channels. It
can be connected to an external low-pass filter to operate as a 14-bit D/A converter.
11.1
Features
•
Division of pulse into multiple base cycles to reduce ripple
•
Four resolution settings
The resolution can be set equal to one, two, 64, or 128 system clock cycles.
•
Two base cycle settings
The base cycle can be set equal to T
×
64 or T
×
256, where T is the resolution.
•
Eight operating speeds
•
Eight operation clocks (by combination of four resolution settings and two base cycle settings)
Figure 11.1 shows a block diagram of the PWM (D/A) module.
Select clock
Bus interface
Clock
Internal data bus
Comparator
Comparator
DADRA
DADRB
PWX1
Internal clock
φ
φ
/2,
φ
/64,
φ
/128
PWX0
Fine-adjustment pulse addition
Fine-adjustment pulse addition
Legend:
DACR
DADRA
DADRB
DACNT
: PWM D/A control register (6 bits)
: PWM D/A data register A (15 bits)
: PWM D/Adata register B (15 bits)
: PWM D/A counter (14 bits)
DACNT
DACR
Control
logic
Base cycle compare match A
Base cycle compare match B
Base cycle overflow
Module data bus
Figure 11.1 PWM (D/A) Block Diagram
PWM1411A_000020020300
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...