32174 datasheet(27/881 Pages) RENESAS

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1-4

32170/32174 Group User's Manual (Rev. 2.1)

OVERVIEW

1.1 Outline

1.1.4 Built-in Clock Frequency Multiplier

• This microcomputer internally multiplies the input clock signal frequency by 4 and the internal

peripheral clock by 2. If the input clock frequency is 10.0 MHz, the CPU clock frequency will be

40 MHz and the internal clock frequency 20 MHz.

1.1.5 Built-in Powerful Peripheral Functions

(1) Built-in multijunction timer (MJT)

• The multijunction timer is configured with the following timers:

(a) 16-bit output-related timer

× 35 channels

(b) 16-bit input/output-related timer

× 10 channels

× 11 channels (incorporating three channels of multiply-by-4

counter)

(d) 32-bit input-related timer

× 8 channels

Each timer has multiple modes of operation, which can be selected according of the purpose of use.

• The multijunction timer has internal clock bus, input event bus, and output event bus, allowing

multiple timers to be combined for use internally. This provides a flexible way to make use of

timer functions.

• The output-related timers (TOP) have a correction function. This function allows the timer's

count value in progress to be increased or reduced as desired, thus materializing real-time

output control.

(2) Built-in 10-channel DMA

• The 10-channel DMA is built-in, supporting data transfers between internal peripheral I/Os or

between internal peripheral I/O and internal RAM. Not only can DMA transfer requests be

generated in software, but can also be triggered by a signal generated by an internal

peripheral I/O (e.g., A-D converter, MJT, or serial I/O).

• Cascaded connection between DMA channels (DMA transfer in a channel is started by

completion of transfer in another) is also supported, allowing for high-speed transfer

processing without imposing any extra load on the CPU.

(3) Built-in 16-channel A-D converters

• This microcomputer contains two 16-channel A-D converters which can convert data in 10-bit

resolution. In addition to single A-D conversion in each channel, successive A-D conversion in

four, eight, or 16 channels combined into one unit is possible.

• In addition to ordinary A-D conversion, a comparator mode is supported in which the A-D

conversion result is compared with a given set value to determine the relative magnitudes of

two quantities.

• When A-D conversion is completed, this microcomputer can generate not only an interrupt, but

can also generate a DMA transfer request.

• This microcomputer supports two read out modes, so that A-D conversion results can be read

out in 8 bits or 10 bits.

32174 Datasheet(PDF) 27 Page - Renesas Technology Corp

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