32172 datasheet(25/875 Pages) RENESAS

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1-4

Rev.1.0

1.1.4 Built-in Clock Multiplier Circuit

• The 32172/32173 internally multiplies the frequency of the input clock signal by 4 (or by 2 for

the internal peripheral clock). When the input clock frequency is 10.0 MHz, the CPU clock

frequency is 40 MHz and that of the internal peripheral clock is 20 MHz.

1.1.5 Built-in Powerful Peripheral Functions

(1) Built-in input/output timers

• The timers used in the 32172/32173 consist of the following 26 channels of timers. (When not

using the PDC module as a sensor interface circuit, eight more channels of input timers are

available.)

16-bit output related timers x 16 channels

16-bit input related timers x 6 channels

32-bit input related timers x 4 channels

Each timer has multiple modes to choose from, depending on the purpose of use.

(2) Built-in 10-channel DMA

• The microcomputer contains 10 channels of DMA, allowing for data transfer between internal

peripheral I/Os and between internal RAM and internal peripheral I/O. DMA transfer requests

can be issued from the user-created software, as well as can be triggered by a signal

generated by the internal peripheral I/O (A-D converter, input/output timer, or serial I/O).

• The microcomputer also supports cascaded operation between DMA channels (starting DMA

transfer on a channel at the end of transfer on another channel). This makes advanced transfer

processing possible without causing any additional CPU load.

(3) Built-in two blocks of A-D converters

• The microcomputer contains an 8-channel A-D converter and a 4-channel A-D converter, both

capable of 10-bit resolution.

• In addition to ordinary A-D conversion, the converters support comparator mode in which a set

value and the A-D converted value are compared to determine which is larger or smaller than

the other.

• When A-D conversion is finished, the converters can generate a DMA transfer request, as well

as an interrupt.

(4) High-speed serial I/O

• The microcomputer contains eight channels of serial I/Os which can be set for clock-

synchronized serial I/O or UART.

• The transfer rate in clock-synchronized serial I/O mode is a high 2 Mbits per second, allowing

for fast data transfer.

• The serial I/O has the function to generate a DMA transfer request when data reception is

Overview

1.1 Overview

32172 Datasheet(PDF) 25 Page - Renesas Technology Corp