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參數(shù)資料
型號(hào)： KIT33742DWEVB
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 20/71頁(yè)
文件大?。?/td> 0K
描述： KIT FOR 33742 SBC WITH EHSCAN
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，CAN 控制器
已用 IC / 零件： MC33742
相關(guān)產(chǎn)品： MC33742DW-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742DWR2-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742SDW-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742SDWR2-ND - IC SYSTEM BASE W/LIN 28-SOIC
Analog Integrated Circuit Device Data
Freescale Semiconductor
27
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
OPERATIONAL MODES
INTRODUCTION
The 33742 has four modes of operation, all controllable via the SPI. The modes are Standby, Normal, Stop, and Sleep. An
additional temporary mode called Normal Request mode is automatically accessed by the device after reset or wake-up from
Stop mode. A Reset mode is also implemented. Special modes and configurations are possible for debug and program
microcontroller flash memory.
Table , page 28, offers a summary of the functional modes.
STANDBY MODE
In Standby mode only the VDD regulator is ON. The V2 regulator is turned OFF by disabling the V2CTRL pin. Other functions
available are the L0:L3 inputs read through via the SPI and HS output activation.
The CAN interface is not able to send messages. If a CAN message is received, the CANWU bit is set. The watchdog timer
is running.
NORMAL MODE
In Normal mode, both the VDD and V2 regulators are in the ON state. All functions are available in this operating mode
(watchdog, wake-up input reading through SPI, HS activation, and CAN communication). The watchdog timer is running and
must be periodically cleared through SPI.
STOP MODE
The V2 regulator is turned OFF by disabling the V2CTRL pin. The VDD regulator is activated in a special low power mode
supplying only a few mA of current. This maintains “keep alive” power for the application’s MCU while the MCU is in a power-
saving state (i.e., a MCU’s version of Stop or Wait). In the Stop mode, the supply current available from VSUP pin is very low.
Both parts (the SBC or the MCU) can be awakened from either the 33742 side (for example, cyclic sense, forced wake-up,
CAN message, wake-up inputs, and over-current on VDD) or from the MCU side (key wake-up, etc.).
Stop mode is always selected via SPI. In Stop mode, the watchdog software may be either running or not running depending
upon selection by SPI (Reset Control Register [RCR], bit WDSTOP). To clear a running watchdog timer, the SBC must be
awakened using the CS pin (SPI wake-up). In Stop mode, wake-up is identical to that in Sleep mode, with the addition of CS and
VDD over-current wake-up. Refer to Table , page 28.
SLEEP MODE
In Sleep mode, the VDD and V2 regulators are OFF. Current consumption from the VSUP pin is cut. In Sleep mode, the SBC
can be awakened by sensing individual level individual level changes in the L0:L3 inputs, by cyclic checking of the L0:L3 inputs,
by the forced wake-up timer, or from the CAN physical interface upon receiving a CAN message. When a wake-up occurs, the
SBC goes first into the Reset mode before entering Normal Request mode.
RESET MODE
In the Reset mode, the RST pin is LOW and a timer runs for tRSTDUR time. After tRSTDUR has elapsed, the 33742 enters the
Normal Request operating mode. The Reset mode is entered if a reset condition occurs (VDD LOW, watchdog time-out, or
watchdog trigger in a closed window).
NORMAL REQUEST MODE
The Normal Request mode is a temporary operating mode automatically entered by the SBC after the Reset mode or after the
33742 wakes up from the Stop mode.
After a wake-up from the Sleep mode or after a device power-up, the SBC enters the Reset mode prior to entering the Normal
Request mode. After a wake-up from the Stop mode, the 33742 enters the Normal Request mode directly.
In Normal Request mode, the VDD regulator is ON, the V2 regulator is OFF, and the RST pin is HIGH. As soon as the SBC
enters the Normal Request mode, an internal 350ms timer is started (parameter tNRTOUT). During this time, the application’s MCU
must address the 33742 via SPI and configure the TIM1 sub register to select the watchdog period. This is required of the SBC
to stop the 350 ms watchdog timer and enter the Normal or Standby mode and to set the watchdog timer configuration.
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