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SMQ320C32PCM Datasheet(PDF) 5 Page - Texas Instruments |
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SMQ320C32PCM Datasheet(HTML) 5 Page - Texas Instruments |
5 / 43 page SMQ320C32 DIGITAL SIGNAL PROCESSOR SGUS027B – APRIL 1998 – REVISED MARCH 1999 5 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 Pin Functions (Continued) PIN CONDITIONS WHEN SIGNAL IS IN HIGH Z‡ DESCRIPTION TYPE† NAME CONDITIONS WHEN SIGNAL IS IN HIGH Z‡ DESCRIPTION TYPE† NO. CONTROL SIGNALS (9 PINS) RESET 1 I Reset. When RESET is a logic low, the device is in the reset condition. When RESET becomes a logic high, execution begins from the location specified by the reset vector. INT3 – INT0 4 I External interrupts CONTROL SIGNALS (9 PINS) (CONTINUED) IACK 1 O/Z Interrupt acknowledge. IACK is set to a logic high by the IACK instruction. This signal can be used to indicate the beginning or end of an interrupt-service routine. S MCBL / MP 1 I Microcomputer bootloader / microprocessor mode XF1 – XF0 2 I/O/Z External flags. XF1 and XF0 are used as general-purpose I / Os or used to support interlocked-processor instructions. S R SERIAL PORT SIGNALS (6 PINS) CLKX0 1 I/O/Z Serial port 0 transmit clock. CLKX0 is the serial shift clock for the serial port 0 transmitter. S R DX0 1 I/O/Z Data transmit output. Serial port 0 transmits serial data on DX0. S R FSX0 1 I/O/Z Frame-synchronization pulse for transmit. The FSX0 pulse initiates the transmit-data process over DX0. S R CLKR0 1 I/O/Z Serial port 0 receive clock. CLKR0 is the serial shift clock for the serial port 0 receiver. S R DR0 1 I/O/Z Data receive. Serial port 0 receives serial data on DR0. S R FSR0 1 I/O/Z Frame-synchronization pulse for receive. The FSR0 pulse initiates the receive-data process over DR0. S R TIMER SIGNALS (2 PINS) TCLK0 1 I/O/Z Timer clock 0. As an input, TCLK0 is used by timer 0 to count external pulses. As an output, TCLK0 outputs pulses generated by timer 0. S R TCLK1 1 I/O/Z Timer clock 1. As an input, TCLK1 is used by timer 1 to count external pulses. As an output, TCLK1 outputs pulses generated by timer 1. S R CLOCK SIGNALS (3 PINS) CLKIN 1 I Input to the internal oscillator from an external clock source H1 1 O/Z External H1 clock. H1 has a period equal to twice CLKIN. S H3 1 O/Z External H3 clock. H3 has a period equal to twice CLKIN. S RESERVED (5 PINS) EMU0 – EMU2 3 I Reserved for emulation. Use 18 k Ω–22 kΩ pullup resistors to 5 V. EMU3 1 O/Z Reserved for emulation S SHZ 1 I Shutdown high impedance. When active, SHZ shuts down the ’C32 and places all 3-state I/O pins in the high-impedance state. SHZ is used for board-level testing to ensure that no dual drive conditions occur. CAUTION: A low on SHZ corrupts ’C32 memory and register contents. Reset the device with SHZ high to restore it to a known operating condition. † I = input, O = output, Z = high-impedance state ‡ S = SHZ active, H = HOLD active, R = RESET active § Recommended decoupling capacitor is 0.1 µF. |
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