NEC 78K0R/KE3 User Manual page 506

16-bit single-chip microcontrollers
Table of Contents

Advertisement

Program processing
Hardware processing
SCL0
1
2
3
SDA0
Remark
IIC0:
STT0:
STD0: Bit 1 of IIC status register 0 (IICS0)
SPD0: Bit 0 of IIC status register 0 (IICS0)
Communication reservations are accepted via the timing shown in Figure 12-22. After bit 1 (STD0) of IIC
status register 0 (IICS0) is set to 1, a communication reservation can be made by setting bit 1 (STT0) of IIC
control register 0 (IICC0) to 1 before a stop condition is detected.
Figure 12-22. Timing for Accepting Communication Reservations
SCL0
SDA0
STD0
SPD0
Figure 12-23 shows the communication reservation protocol.
506
CHAPTER 12 SERIAL INTERFACE IIC0
Figure 12-21. Communication Reservation Timing
STT0 = 1
Communi-
cation
reservation
4
5
6
7
Generate by master device with bus mastership
IIC shift register 0
Bit 1 of IIC control register 0 (IICC0)
Standby mode (Communication can be reserved
by setting STT to 1 during this period.)
User's Manual U17854EJ9V0UD
Write to
IIC0
Set SPD0
Set
and
STD0
INTIIC0
8
9
1
2
3
4
5
6

Advertisement

Table of Contents
loading

Table of Contents