7721 datasheet(11/577 Pages) RENESAS

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7721 Group User’s Manual

Table of contents

9.5 Pulse period/Pulse width measurement mode ............................................................. 9-19

9.5.1 Setting for pulse period/pulse width measurement mode ...................................... 9-21

9.5.2 Count source ................................................................................................................ 9-22

9.5.3 Operation in pulse period/pulse width measurement mode ................................... 9-23

[Precautions for pulse period/pulse width measurement mode] ...................................... 9-25

CHAPTER 10 REAL-TIME OUTPUT

10.1 Overview ............................................................................................................................. 10-2

10.2 Block description .............................................................................................................. 10-4

10.2.1 Real-time output control register ............................................................................. 10-4

10.2.2 Pulse output data registers 0 and 1 ....................................................................... 10-5

10.2.3 Port P6 direction register ......................................................................................... 10-6

10.2.4 Timers A0 and A1 ..................................................................................................... 10-6

10.3 Setting of real-time output ............................................................................................. 10-7

10.4 Real-time output operation ........................................................................................... 10-10

CHAPTER 11 SERIAL I/O

11.1 Overview ............................................................................................................................. 11-2

11.2 Block description .............................................................................................................. 11-3

11.2.1 UARTi transmit/receive mode register .................................................................... 11-4

11.2.2 UARTi transmit/receive control register 0 .............................................................. 11-6

11.2.3 UARTi transmit/receive control register 1 .............................................................. 11-7

11.2.4 UARTi transmit register and UARTi transmit buffer register ............................... 11-9

11.2.5 UARTi receive register and UARTi receive buffer register ................................ 11-11

11.2.6 UARTi baud rate register (BRGi) .......................................................................... 11-13

11.2.7 UARTi transmit interrupt control and UARTi receive interrupt control registers ......................... 11-14

11.2.8 Port P8 direction register ....................................................................................... 11-15

11.3 Clock synchronous serial I/O mode ........................................................................... 11-16

11.3.1 Transfer clock (Synchronizing clock) .................................................................... 11-17

11.3.2 Method of transmission ........................................................................................... 11-18

11.3.3 Transmit operation ................................................................................................... 11-21

11.3.4 Method of reception ................................................................................................ 11-23

11.3.5 Receive operation .................................................................................................... 11-27

11.3.6 Processing on detecting overrun error ................................................................. 11-29

[Precautions for clock synchronous serial I/O mode] ..................................................... 11-30

11.4 Clock asynchronous serial I/O (UART) mode .......................................................... 11-31

11.4.1 Transfer rate (Frequency of transfer clock) ......................................................... 11-32

11.4.2 Transfer data format ............................................................................................... 11-33

11.4.3 Method of transmission ........................................................................................... 11-34

11.4.4 Transmit operation ................................................................................................... 11-38

11.4.5 Method of reception ................................................................................................ 11-41

11.4.6 Receive operation .................................................................................................... 11-44

11.4.7 Processing on detecting error ................................................................................ 11-46

11.4.8 Sleep mode .............................................................................................................. 11-47

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