Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 512 of 872
REJ09B0286-0300
17.4.2
Operation Reservation Commands
Table 17.6 lists the operation reservation commands that can be set in ICCMD. If values other
than H'A0 to H'AF, and H'C0 to H'CF are set, H'A0 is automatically set as the command.
The operation reservation commands reserve various operations such as start condition issuance,
stop condition issuance, data transmission (including acknowledge (ACK)/non-acknowledge
(NAK) judgment), and data reception (including ACK/NAK transmission and stop condition
issuance). Since 16 bits can be simultaneously written to ICCMD and ICDRX, a series of required
operations can be written as the transfer data (data + command) for data transmission.
Table 17.7 shows the changes in interrupt flag status and automatic command transition when the
operation reservation command is completed. Each IIC data set consists of the first frame (address
+ read/write) and the subsequent frames (data). Each frame consists of 8-bit data and ACK/NAK;
transmission of ACK or NAK and enabling or disabling NAK judgment must be specified using
the command. The corresponding commands are updated by a command request interrupt (CREQ)
issued after the operation reservation command is completed or automatically updated by the
automatic command transition function. The commands corresponding to the first frame allow
automatic transition. The commands corresponding to the subsequent frames are divided into two
types; some are used for continuous data, which do not allow automatic transition, and others are
used for the last data or a stop condition, which allow automatic transition. A command also
allows automatic transition when arbitration loss occurs.
The commands for continuous data generate a data transfer request interrupt (MRREQ, MTREQ,
SRREQ, or STREQ) after the operation specified by the command is completed (one byte is
processed). To process the last data, update the command at interrupt generation.
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...