32174 datasheet(28/881 Pages) RENESAS

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1-5

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

OVERVIEW

1.1 Outline

(4) High-speed serial I/O

• This microcomputer incorporates 6 channels of serial I/O, which can be set for clock-

synchronized serial I/O or UART.

• When set for clock-synchronized serial I/O, the data transfer rate is a high 2 Mbits per second.

• When data reception is completed or the transmit buffer becomes empty, the serial I/O can

generate a DMA transfer request signal.

(5) Built-in Real-Time Debugger (RTD)

• The Real-Time Debugger (RTD) provides a function for the M32R/ECU's internal RAM to be

accessed directly from an external device. The debugger communicates with external devices

through its exclusive clock-synchronized serial I/O.

• By using the RTD, you can read the contents of the internal RAM or rewrite its data from an

external device independently of the M32R.

• The debugger can generate an RTD interrupt to notify that RTD-based data transmission or

reception is completed.

(6) Eight-level interrupt controller

• The interrupt controller manages interrupt requests from each internal peripheral I/O by

resolving interrupt priority in eight levels including an interrupt-disabled state. Also, it can

accept external interrupt requests due to power-down detection or generated by a watchdog

timer as a System Break Interrupt (SBI).

(7) Three operation modes

• The M32R/ECU has three operation modes-single-chip mode, extended external mode, and

processor mode. The address space and external pin functions of the M32R/ECU are

switched over according to a mode in which it operates. The MOD0 and MOD1 pins are used

to set a mode.

(8) Wait controller

• The wait controller supports access to external devices by the M32R. In all but single-chip

mode, the extended external area provides 4 Mbytes of space.

32174 Datasheet(PDF) 28 Page - Renesas Technology Corp