Renesas rl78 User Manual

RL78/G1A

CHAPTER 12 SERIAL ARRAY UNIT

R01UH0305EJ0200 Rev.2.00

465

Jul 04, 2013

(4) Processing flow (in continuous transmission/reception mode)

Figure 12-46. Timing Chart of Master Transmission/Reception (in Continuous Transmission/Reception Mode)

(Type 1: DAPmn = 0, CKPmn = 0)

SSmn

SEmn

SDRmn

SCKp pin

SIp pin

INTCSIp

TSFmn

SOp pin

BFFmn

<1>

Note 1

MDmn0

STmn

Transmit data 1

Transmit data 2

Transmit data 3

Receive data 1

Receive data 2

Receive data 3

Receive data 1

Receive data 2

Receive data 3

Transmit data 1

Transmit data 2

Transmit data 3

Reception & shift operation

Data transmission/reception

Write

Read

<8>

<2>

<3>

<2>

<4>

<5>

<6> <7>

Note 2

Shift

Notes 1. If transmit data is written to the SDRmn register while the BFFmn bit of serial status register mn

(SSRmn) is 1 (valid data is stored in serial data register mn (SDRmn)), the transmit data is overwritten.

2. The transmit data can be read by reading the SDRmn register during this period. At this time, the

transfer operation is not affected.

Caution The MDmn0 bit of serial mode register mn (SMRmn) can be rewritten even during operation.

However, rewrite it before transfer of the last bit is started, so that it has been rewritten before the

transfer end interrupt of the last transmit data.

Remarks 1. <1> to <8> in the figure correspond to <1> to <8> in Figure 12-47 Flowchart of Master

Transmission/Reception (in Continuous Transmission/Reception Mode).

2. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), p: CSI number (p = 00, 01, 10, 11, 20, 21),

mn = 00 to 03, 10, 11

<R>