h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 325

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

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
Figure 11.1 shows a block diagram of the PWM (D/A) module.
PWM1411A_000020020300
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
Eight operating speeds
Eight operation clocks (by combination of four resolution settings and two base cycle settings)
PWX0
PWX1
Features
Legend:
DACR
DADRA
DADRB
DACNT
Section 11 14-Bit PWM Timer (PWMX)
: 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)
Select clock
Control
logic
Figure 11.1 PWM (D/A) Block Diagram
Internal clock
Base cycle compare match A
Fine-adjustment pulse addition
Base cycle compare match B
Fine-adjustment pulse addition
Base cycle overflow
/2, /64, /128
Clock
64 or T
Comparator
Comparator
256, where T is the resolution.
DACNT
DACR
Rev. 3.00 Jan 25, 2006 page 273 of 872
Section 11 14-Bit PWM Timer (PWMX)
DADRA
DADRB
Internal data bus
Module data bus
Bus interface
REJ09B0286-0300