参数资料
型号: MC33889DPEG
厂商: Freescale Semiconductor
文件页数: 37/59页
文件大小: 0K
描述: IC SYSTEM BASE W/CAN 28SOIC
标准包装: 26
系列: *
Analog Integrated Circuit Device Data
42
Freescale Semiconductor
33889
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Table 8. List of Registers
NOTE: For SPI Operation
In case a low pulse is asserted by the device on the RST output pin during a SPI message,
the SPI message can be corrupted. An RST low pulse is asserted in 2 cases:
Case 1: W/D refresh issue: The MCU does not perform the SPI watchdog refresh command
before the expiration of the timeout (in Normal mode or Normal Request mode and if the
“Timeout watchdog” option is selected), or the SPI watchdog refresh command is performed
in the closed window (in Normal mode and if “Window watchdog” option is selected).
Case 2: VDD undervoltage condition: VDD falls below the VDD undervoltage threshold.
Message corruption means that the targeted register address can be changed, and another
register is written. Table 9 shows the various cases and impacts on SPI register address:
Name
Address
Description
Comment and usage
MCR
$0 0 0
Mode control register
Write: Control of normal, standby, sleep, and stop modes
Read: BATFAIL flag and other status bits and flags
RCR
$0 0 1
Reset control register
Write: Configuration of reset voltage level, WD in stop mode, low power
mode selection
Read: CAN wake-up event, Tx permanent dominant
CAN
$0 1 0
CAN control register
Write: CAN module control: TX/RX, Rec only, term VBAT, Normal and
extended modes, filter at L0 input.
Read: CAN failure status bits
IOR
$0 1 1
I/O control register
Write: HS1 (high-side switch) control in normal and standby mode.
Gnd shift register level selection
Read: HS1 over temp bit, SHIFT bit (gnd shift above selection), VSUP
below 6.1V, V2 below 4.0 V
WUR
$1 0 0
Wake-up input register
Write: Control of wake-up input polarity
Read: Wake-up input, and real time LX input state
TIM
$1 0 1
Timing register
Write: TIM1, Watchdog timing control, window or Timeout mode.
Write: TIM2, Cyclic sense and force wake-up timing selection
LPC
$1 1 0
Low power mode
control register
Write: HS1 periodic activation in sleep and stop modes
Force wake-up control
INTR
$1 1 1
Interrupt register
Write: Interrupt source configuration
Read: INT source
Table 9. Possible Corrupted Registers In Case of RST Pulse During SPI Communication
Resulting Written register
Register
MCR
RCR
CAN
IOR
Address
$000
$001
$010
$011
Target
written
register
Register
Address
CAN
$010
X
IOR
$011
X
WUR
$100
X
TIM1/2
$101
X
LPC
$110
X
INTR
$111
X
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