33813 Datasheet, PDF (43/54 Pages) Freescale Semiconductor, Inc – One Cylinder Small Engine Control IC

Table 21 defines the commands and default state of the internal registers at POR. SPI commands may be sent to the device at
any time while the device is in the Normal state.
Messages sent are acted upon on the rising edge of the CSB input.
Bit value returned equals bit value sent for this command
Table 21. SPI Command Messages
Command
Control Address Bits
Data Bits
hex 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
SPI Check
0
0
0
0
0 X* X* X* X* X* X* X* X* X* X* X* X*
Read Configuration 1
0
0
0
1
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Register
Internal Register Address
Write Configuration ₂
0
0
1
0
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Register
Internal Register Address
Read Status
Register
3
0
0
1
1
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Internal Register Address
Write Status
Register
4
0
1
0
0
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Internal Register Address
Read Control
Register
5
0
1
0
1
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Internal Register Address
Write Control
Register
6
0
1
1
0
<0000>
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Internal Register Address
SPI Check
Response
7
0
1
1
1 X* X* X* X* X* X* X* X* X* X* X* X*
5.3.10 SPI Commands
There are seven SPI commands that can be issued by the MCU to:
• Do a SPI Check verification
• Read the contents of the SPI configuration registers
• Write the contents of the SPI configuration registers
• Read the contents of the SPI status registers
• Write the contents of the SPI status registers
• Read the contents of the SPI control registers
• Write the contents of the SPI control registers
5.3.10.1 SPI Registers
The SPI interface consists of a block of four 8-bit read/write registers.
There are three types of SPI registers:
• Configuration Registers - These registers allow the MCU to configure the various parameters and options for the various
functional blocks.
• Control Registers - These registers are used to command the outputs on and off and set the PWM duty cycle values.
• Status Registers - These registers report back faults and other conditions of the various functional blocks.
The following acronyms are use in the SPI table:
• OC = over-current, could be short to battery (SB)
• OV = over-voltage
• OT = over-temperature
• OL = open load
• SG = short to ground
• PWM = pulse width modulation
Analog Integrated Circuit Device Data
Freescale Semiconductor
33813
43