p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 235

• Manufacturer Part Number: p2125vps20
• Description: 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.
10.1
• Division of pulse into multiple base cycles to reduce ripple
• Eight resolution settings
• Two base cycle settings
• Sixteen operation clocks (by combination of eight resolution settings and two base cycle
Figure 10.1 shows a block diagram of the PWM (D/A) module.
PWM1420A_000020020300
The resolution can be set to 1, 2, 64, 128, 256, 1024, 4096, or 16384 system clock cycles.
The base cycle can be set equal to T × 64 or T × 256, where T is the resolution.
settings)
[Legend]
DACR:
DADRA:
DADRB:
DACNT:
PCSR:
PCSR
PWX0
PWX1
Features
PWMX D/A control register (6 bits)
PWMX D/A data register A (15 bits)
PWMX D/A data register B (15 bits)
PWMX D/A counter (14 bits)
Peripheral clock select register
Section 10 14-Bit PWM Timer (PWMX)
Select clock
Control
logic
Figure 10.1 PWMX (D/A) Block Diagram
Internal clock
Base cycle compare match A
Fine–adjustment pulse addition A
Base cycle compare match B
Fine–adjustment pulse addition B
φ
φ/2, φ/64, φ/128, φ/256,
φ/1024, φ/4096, φ/16384
Base cycle overflow
Clock
Comparator A
Comparator B
DACNT
DACR
Rev. 1.00 Sep. 21, 2006 Page 197 of 658
Section 10 14-Bit PWM Timer (PWMX)
DADRA
DADRB
Internal data bus
Module data bus
Bus interface
REJ09B0310-0100