1
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
(c) 16-bit input-related timer
× 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.