KIT33912EVME Freescale Semiconductor, KIT33912EVME Datasheet - Page 28

• Manufacturer Part Number: KIT33912EVME
• Description: MCU, MPU & DSP Development Tools For MC33912 RS-232 SPI
• Manufacturer: Freescale Semiconductor

Specifications of KIT33912EVME

• Processor To Be Evaluated: MC33912
• Interface Type: RS-232, SPI
• Operating Supply Voltage: 12 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Embedded Slave Software
Chapter 6 Embedded Slave Software
6.1
This chapter describes the embedded generic Slave software. It gives basic information on how to use the embedded software
features successfully. The following sections provide the basic information:
6.2
Generic Control of the MC33912 device is through the SPI channel. Control data is transported to the MCU by FreeMASTER
protocol or LIN protocol, as well as data from the A/D converter and MCU memory.
The units that are transported in a LIN diagnostic frame are called PDU’s (Packet Data Unit). A PDU used for Generic Control of
the device is a Single Frame message based on the User Defined Diagnostics specification. The diagnostic format sends a fixed
master request frame with eight data bytes provided. This is used to issue specific Generic Control fixed frames.
Messages issued by the master are called requests, and messages issued by the slave are called responses. Requests are
always sent in master request frames and responses are always sent in slave response frames. The Master request frame has
a fixed identifier, 60 (0x3C) and a fixed size (8 bytes). The Slave response frame has a fixed identifier, 61 (0x3D) and a fixed size
(8 bytes).
The meaning of each byte in a PDU is defined in the following sections.
6.2.1 Generic Control PDU Structure
The Generic Control PDU structure is described in this section; see
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Overview
6.2, Generic Control Slave Software Description
6.2.1, Generic Control PDU Structure
6.2.2, CMD data interpretation
6.3, MCU Reprogram
Generic Control Slave Software Description
NAD
CMD
NAD is the address of the slave node being addressed by a request. NAD is also used to indicate the source of the
response.
Generic Control is uses Free NAD values, meaning that the NAD value must be selected from the range 128 (0x80)
- 255 (0xFF), and not to be interpreted as a diagnostic. For the KIT33912EVME NAD - 160 (0xA0) is used.
CMD is a command being sent by the master in a request to be interpreted by the slave. CMD is also used to
interpret the status data in a response.
CMD code:
0 = SPI - read and write SPI data registers through the SPI channel
1 = PWM - write a value to the MCU pulse width modulation registers
2 = ADC - read data from the A/D converter the MCU registers
3 = TOOLS_TO_MCU - special commands to change the MCU state and activity
4 = TOOLS_TO_PC - special commands to read the MCU state and activity
KIT33912EVME System Basis Chip with LIN Tranceiver Setup Instructions, Rev. 2.0
Response
Request
Figure 6-1. Generic Control PDU Structure
NAD
NAD
The left byte (NAD) is sent first
CMD
CMD
S0
M0
Figure
S1
M1
6-1.
S2
M2
S3
M3
S4
M4
Freescale Semiconductor
S5
M5