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EM6812F2TP24B Datasheet(PDF) 17 Page - EM Microelectronic - MARIN SA |
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EM6812F2TP24B Datasheet(HTML) 17 Page - EM Microelectronic - MARIN SA |
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17 / 81 page  R EM6812 Copyright © 2005, EM Microelectronic-Marin SA 17 www.emmicroelectronic.com 7 Reset Controller 7.1 Basic features Internal and external reset sources are handled within the RESET controller. All these reset are used to put the device in a defined state at power-up, user request or system exceptions. The reset sources are flagged, and may be inspected by the CPU after the reset event to allow detection of the reset source. Any Reset will keep the CPU in reset for state for approx. 300µs once the reset condition released. Internal sources Power on Reset with powercheck at start-up BrownOut detection as voltage supervisory function Watchdog reset with protected disable key External sources Reset Pad (User reset) Input reset combination on PortA All these sources may initialize or re-initialize either the whole or part of the circuit. These sources are: Table 15: Reset sources Function Signal Activated reset signals POR POR POR, ResMain, ResSys, ResSysSleep, ResCPU Reset Pad DebResetPad ResMain, ResSys, ResSysSleep, ResCPU PowerCheck PwrCheck ResCPU Port A Input Reset DebResInpPA ResSys, ResSysSleep, ResCPU Watchdog Reset ResetWD ResSys, ResSysSleep, ResCPU Brownout Reset BrownOut ResSys, ResSysSleep, ResCPU Sleep Sleep ResSysSleep, ResCPU After every reset the circuit restart with RC clock 1MHz as the only clock selection. The periphery is released from reset after 128 RC clocks (Reset synchronizer) and the CPU 64 RC clocks later (CPU Reset Delay). Figure 8. Reset controller architecture POR : initializes the whole circuit; ResMain : initializes the whole circuit except the ResetPad configuration ResSys : initializes all internal registers, does nor reset the terminal configuration settings (I.e. pull resistors) ResSysSleep : Enables the path to be able to come out of sleep. ResCPU : Initializes the CPU Signals POR, ResMain, ResSys, ResSysSleep, ResCPU are the actual reset signals which initialize the different latches and registers. Please refer to the different register tables to know the reset source for each register bit. Note : - BrownOut reset will set the BrownOut flag but also the ResInpPA flag if DisResInp is set. - If the power up is faster than the BrownOut Filter (~10ms) no Reset Flag will be set. (allowing POR identification) - In case of slow power up, both the BrownOut and the ResPAInp flag will show. The bit SleepEn (reset by POR only) may be used to distinguish between a slow power up and a ‘normal ‘ BrownOut condition. POR ResSysSlp ResMain ResCPU ResSys DisResetPad POR DisResInp ResetWD BrownOut Sleep PwrCheck Flag on Reset Source Reset Synchronizer 128 ck RC CPU Reset Delay 192 ck RC POR ResSys ResCPU 128 ck RC 192 ck RC DebResInpPA DebResetPad |
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