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Intel 87C196CA, 8XC196Jx, 8XC196Kx, 8XC196Lx Figure 8-10. IFR Type 2 Message Frame 8.4.2.3 IFR Messaging Type 3: Multiple Bytes, Single Responder, Figure 8-11. IFR Type 3 Message Frame

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8-13

J1850 COMMUNICATIONS CONTROLLER

Figure 8-10. IFR Type 2 Message Frame

8.4.2.3 IFR Messaging Type 3: Multiple Bytes, Single Responder

IFR messaging type 3 (Figure 8-11) is ideal for requesting large amounts of information from asingle source in your system. You can compile up to 12 bytes of data from a remote node on asingle request. In our example, for the same amount of CPU overhead as IFR type 1 messagingexhausted (4.96 ms), you can gather up to twelve times as much information.

Figure 8-11. IFR Type 3 Message Frame

8.5 TRANSMITTING AND RECEIVING MESSAGESThe J1850 controller can transmit and receive messages in either standard or IFR form.8.5.1 Transmitting MessagesTo transmit a standard message, prepare the message in register RAM and then write it to theJ1850 transmit (J_TX) register (Figure 8-12) one byte at a time.

A5227-01

0-1 Byte

CRC

E

O

D

S

O

F

E

O

F

I

F

S

The number of data bytes to be transferred is unspecified if 0EH is written to J_CMD3:0.

Each DX block in the IFR data field represents a byte of data from a different remote node.

1 Byte

CRC

E

O

D

N

B

1-3 Bytes

Header 1-11 Bytes

Data†

IFR Data Field

††

In-frame Response (IFR) Frame

††

†

D31

. . . . . . . . . .

D1

D0

A5228-01

0-1 Byte

CRC

E

O

D

S

O

F

E

O

F

I

F

S

The number of data bytes to be transferred is unspecified if 0EH is written to J_CMD3:0.

1-12 Bytes

IFR Data

1 Byte

CRC

E

O

D

N

B

1-3 Bytes

Header 1-11 Bytes

Data†

In-frame Response (IFR) Frame

†

Contents

Main Page Page Page Page FIGURES Page TABL ES Page Page CHAPTER 1 GUIDE TO THIS MANUAL Page Page Page CHAPTER 2 ARCHITECTURAL OVERVIEW Page 2-3 ARCHITECTURAL OVERVIEW Figure 2-2. Clock Circuitry (87C196LA, LB Only) F F 2F Page ARCHITECTURAL OVERVIEW Figure 2-4. Effect of Clock Mode on Internal CLKOUT Frequency Table 2-3. Relationships Between Input Frequency, Clock Multiplier, and State Times Page Page Page Page Page CHAPTER 3 ADDRESS SPACE Table 3-1. Address Map SUPPLEMENT NOTE Table 3-1. Address Map (Continued) Figure 3-1. Register File Address Map Table 3-2. Register File Memory Addresses Upper Register File Lower Register File Stack Pointer Address General-purpose Register RAM SUPPLEMENT Table 3-3. 8XC196L Peripheral SFRs Table 3-3. 8XC196L Peripheral SFRs (Continued) SUPPLEMENT Table 3-4. Windows Table 3-4. Windows (Continued) SUPPLEMENT Table 3-4. Windows (Continued) Page Page Page SUPPLEMENT Table 4-1. Interrupt Sources, Vectors, and Priorities Figure 4-1. Interrupt Mask (INT_MASK) Register SUPPLEMENT Figure 4-2. Interrupt Mask 1 (INT_MASK1) Register Figure 4-3. Interrupt Pending (INT_PEND) Register SUPPLEMENT Figure 4-4. Interrupt Pending 1 (INT_PEND1) Register Figure 4-5. PTS Select (PTSSEL) Register SUPPLEMENT Figure 4-6. PTS Service (PTSSRV) Register Page Page CHAPTER 5 I/O PORTS Page 5-3 I/O PORTS Figure 5-1. Ports 1, 2, 5, and 6 Internal Structure (87C196LA, LB Only) Page Page SUPPLEMENT Figure 5-2. Ports 3 and 4 Internal Structure (87C196LA, LB Only) 5-6 Page Page CHAPTER 6 SYNCHRONOUS SERIAL I/O PORT Figure 6-1. SSIO 0 Clock (SSIO0_CLK) Register SUPPLEMENT Figure 6-2. SSIO 1 Clock (SSIO1_CLK) Register SYNCHRONOUS SERIAL I/O PORT Figure 6-2. SSIO 1 Clock (SSIO1_CLK) Register (Continued) Page Page Page CHAPTER 7 EVENT PROCESSOR ARRAY SUPPLEMENT Figure 7-1. EPA Block Diagram (87C196LA, LB Only) 7-2 7-3 EVENT PROCESSOR ARRAY Figure 7-2. EPA Block Diagram (83C196LD Only) SUPPLEMENT Figure 7-4. EPA Interrupt Mask 1 (EPA_MASK1) Register Figure 7-3. EPA Interrupt Mask (EPA_MASK) Register EVENT PROCESSOR ARRAY Figure 7-6. EPA Interrupt Pending 1 (EPA_PEND1) Register Figure 7-5. EPA Interrupt Pending (EPA_PEND) Register SUPPLEMENT Page Page CHAPTER 8 J1850 COMMUNICATIONS CONTROLLER SUPPLEMENT 8-2 Figure 8-2. J1850 Communications Controller Block Diagram Peripheral Data Bus Table 8-1. J1850 Controller Signals Table 8-2. Control and Status Registers Page Page Page Page Page Page Page Figure 8-8. Definition for Start and End of Frame Symbols Table 8-4 details the symbol timing characteristics supported by the 87C196LB. Table 8-4. Huntzicker Symbol Timing Characteristics Page 8-13 Figure 8-10. IFR Type 2 Message Frame 8.4.2.3 IFR Messaging Type 3: Multiple Bytes, Single Responder . . . . . . . . . . Figure 8-11. IFR Type 3 Message Frame Page Page Page Figure 8-16. J1850 Command (J_CMD) Register SUPPLEMENT Figure 8-17. J1850 Configuration (J_CFG) Register J1850 COMMUNICATIONS CONTROLLER Figure 8-17. J1850 Configuration (J_CFG) Register (Continued) SUPPLEMENT Figure 8-18. J1850 Delay (J_DLY) Register Figure 8-19. J1850 Status (J_STAT) Register SUPPLEMENT Figure 8-19. J1850 Status (J_STAT) Register (Continued) Page Page CHAPTER 9 MINIMUM HARDWARE CONSIDERATIONS Page Page Page Page 8XC196L SUPPLEMENT F 2F 10-2 Page Page Page Page CHAPTER 11 PROGRAMMING THE NONVOLATILE MEMORY SUPPLEMENT Table 11-2. 87C196LA, LB OTPROM Address Map 11-3 PROGRAMMING THE NONVOLATILE MEMORY 10 EA# dynamic failure analysis of the device is impossible. Figure 11-1. Slave Programming Circuit Table 11-3. Slave Programming Mode Address Map SUPPLEMENT Figure 11-2. Serial Port Programming Circuit Page Page Page Page Page SUPPLEMENT Table A-1. 87C196LA Signals Arranged by Functional Categories Figure A-1. 87C196LA 52-pin PLCC Package A3419-03 A-3 xx87C196LA20 View of component as mounted on PC board SUPPLEMENT Table A-2. 87C196LB Signals Arranged by Functional Categories Figure A-2. 87C196LB 52-pin PLCC Package A3361-03 A-5 xx87C196LB20 View of component as mounted on PC board SUPPLEMENT Table A-3. 83C196LD Signals Arranged by Functional Categories A-7 Figure A-3. 83C196LD 52-pin PLCC Package Table A-4. Definition of Status Symbols xx83C196LD View of component as mounted on PC board SUPPLEMENT Table A-5. 87C196LA, LB Default Signal Conditions Table A-6. 83C196LD Default Signal Conditions Page Page Page GLOSSARY Page Page Page Page Page Page Page Page Page Page Page Page Page INDEX A B C D P R S U W