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ST18952 Datasheet(PDF) 7 Page - STMicroelectronics |
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ST18952 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 67 page 7/66 ST18952 Table 2.7 D950Core control (10 pins) Table 2.8 Emulation unit (7 pins) Pin name Type Description RESET I Reset input. Active low. Initializes the 950-Core to the RESET state. RESET_OUT O Reset output (system reset). Active low. LP I Low power input. Active low. LPACK O Low power acknowledge. Active low. MODE I Mode selection for Reset. 0: forces reset address to 0x0000 1: forces reset address to 0xFC00 IRD_WR O Program memory read/write indicator. VCI O Valid coprocessor instruction output. Asserted low during the instruction cycle preceding a coprocessor instruc- tion to enable operation of an external coprocessor. STACKX O X stack read/write instruction flag. STACKY O Y stack read/write instruction flag. IDT_EN I I-bus direct transfer enable (to BSU peripheral). Active low. Pin name Type Description ERQ I Emulator Halt Request. Active low. Halts program execution and enters emulation mode. IDLE O Output flag asserted high when the processor is halted due to an emulation halt request or a valid breakpoint condition.Asserted low when the proces- sor is not Halted or during execution of an instruction under control of the emulator. HALTACK O Halt acknowledge. Active high. Asserted high when the processor is halted from an Emulator Halt request or when a valid Breakpoint condition is met. SNAP O Snapshot. Active high. Asserted high when executing an instruction if Snapshot mode is enabled. AXEBP I Enable breakpoint on X address bus when high. AYEBP I Enable breakpoint on Y address bus when high. AIEBP_SCAN_EN I Enable breakpoint on I address bus when high. |
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