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參數(shù)資料
| 型號： | KIT33989DWEVB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 15/72頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL 33989DW HS SBC |
| 標準包裝： | 1 |
| 主要目的： | 接口，CAN 控制器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MC33989 |
| 主要屬性： | CAN 2.0 系統(tǒng)基礎芯片（SBC），SPI 接口，2 低壓降穩(wěn)壓器 |
| 次要屬性： | 故障檢測，睡眠和待機模式 |
| 已供物品： | 板，CD |
| 相關產(chǎn)品： | MC33989DWR2CT-ND - IC SYSTEM BASE W/CAN 28-SOIC MC33989DWR2TR-ND - IC SYSTEM BASE W/CAN 28-SOIC MC33989DW-ND - IC SYSTEM BASE W/CAN 28-SOIC |
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Analog Integrated Circuit Device Data
22
Freescale Semiconductor
33989
FUNCTIONAL DEVICE OPERATION
RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS
APPLICATION WAKE-UP FROM MCU SIDE
When application is in Stop mode, the wake-up event may come from the MCU side. In this case the MCU signals to the SBC
by a low to high transition on the CS pin. Then the SBC goes into Normal Request mode and generates an interrupt pulse at the
INT pin.
STOP MODE CURRENT MONITOR
If the VDD1 output current exceed an internal threshold (IDD1SWU), the SBC goes automatically into Normal Request mode and
generates an interrupt at the INT pin. The interrupt is not maskable and the interrupt register will has no flag set.
INTERRUPT GENERATION WHEN WAKE-UP FROM STOP MODE
When the SBC wakes up from Stop mode, it first enters the Normal Request mode before generating a pulse (10 s typical)
on the INT pin. These interrupts are not maskable, and the wake-up event can be read through the SPI registers (CANWU bit in
Reset Control Register (RCR) and LCTRx bit in Wake-up Register (WUR). In case of wake-up from Stop mode over current or
from forced wake-up, no bit is set. After the INT pulse the SBC accept SPI command after a time delay (tS1STSPI parameter).
SOFTWARE WATCHDOG IN STOP MODE
If Watchdog is enabled, the MCU has to wake-up independently of the SBC before the end of the SBC watchdog time. In order
to do this, the MCU must signal the wake-up to the SBC through the SPI wake-up (CS activation). The SBC then wakes up and
jumps into the Normal Request mode. MCU has to configured the SBC to go to either Normal or Standby mode. The MCU can
then decide to go back again to Stop mode.
When there is no MCU wake-up occurring within the watchdog timing, the SBC activates the Reset pin, jumping into the
Normal Request mode. The MCU can then be initialized.
STOP MODE ENTER COMMAND
Stop mode is entered at the end of the SPI message, and at the rising edge of the CS. Please refer to the t CSSTOP data in the
Once Stop mode is entered the SBC could wake-up from the V1 regulator overcurrent detection. In order to allow time for the
MCU to complete the last CPU instruction, allowing the MCU to enter its low power mode, a deglitcher time of typical 40 s is
implemented.
Figure 9 indicates the operation to enter Stop mode.
Figure 9. Operation Entering Stop Mode
RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS
SOFTWARE WATCHDOG (SELECTABLE WINDOW OR TIMEOUT WATCHDOG)
Software watchdog uses in the SBC Normal and Standby modes is to monitor MCU. The Watchdog can be either window or
timeout. This is selectable by SPI (register TIM1, bit WDW). Default is window watchdog. The period for the watchdog is
selectable from the SPI from 10 ms to 350 ms (register TIM1, bits WDT0 and WDT1). When the window watchdog is selected,
the closed window is the first part of the selected period, and the open window is the second part of the period. Refer to the SPI
SPI CS
SPI Stop/ Sleep Command
SBC in Normal or Stand-by mode
SBC in Stop mode
IDD1DGLT
tCSSTOP
with IDD1over I wake-up
no IDD1 over I wake-up
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