Electronic Components Datasheet Search |
|
ADSP-2109LKP-55 Datasheet(PDF) 5 Page - Analog Devices |
|
ADSP-2109LKP-55 Datasheet(HTML) 5 Page - Analog Devices |
5 / 36 page ADSP-2104/ADSP-2109 REV. 0 –5– The interrupt control register, ICNTL, allows the external interrupts to be set as either edge- or level-sensitive. Depending on bit 4 in ICNTL, interrupt service routines can either be nested (with higher priority interrupts taking precedence) or be processed sequentially (with only one interrupt service active at a time). The interrupt force and clear register, IFC, is a write-only register that contains a force bit and a clear bit for each interrupt. When responding to an interrupt, the ASTAT, MSTAT, and IMASK status registers are pushed onto the status stack and the PC counter is loaded with the appropriate vector address. The status stack is seven levels deep to allow interrupt nesting. The stack is automatically popped when a return from the interrupt instruction is executed. Pin Definitions Table II shows pin definitions for the ADSP-2104/ADSP-2109 processors. Any inputs not used must be tied to VDD. SYSTEM INTERFACE Figure 3 shows a typical system for the ADSP-2104/ADSP-2109, with two serial I/O devices, a boot EPROM, and optional external program and data memory. A total of 14.25K words of data memory and 14.5K words of program memory is addressable. Programmable wait-state generation allows the processors to easily interface to slow external memories. The ADSP-2104/ADSP-2109 also provides either: one external interrupt (IRQ2) and two serial ports (SPORT0, SPORT1), or three external interrupts (IRQ2, IRQ1, IRQ0) and one serial port (SPORT0). Clock Signals The ADSP-2104/ADSP-2109’s CLKIN input may be driven by a crystal or by a TTL-compatible external clock signal. The CLKIN input may not be halted or changed in frequency during operation, nor operated below the specified low frequency limit. If an external clock is used, it should be a TTL-compatible signal running at the instruction rate. The signal should be connected to the processor’s CLKIN input; in this case, the XTAL input must be left unconnected. Because the processor includes an on-chip oscillator circuit, an external crystal may also be used. The crystal should be con- nected across the CLKIN and XTAL pins, with two capacitors connected as shown in Figure 2. A parallel-resonant, fundamen- tal frequency, microprocessor-grade crystal should be used. Table II. ADSP-2104/ADSP-2109 Pin Definitions Pin # of Input / Name(s) Pins Output Function Address 14 O Address outputs for program, data and boot memory. Data1 24 I/O Data I/O pins for program and data memories. Input only for boot memory, with two MSBs used for boot memory addresses. Unused data lines may be left floating. RESET 1 I Processor Reset Input IRQ2 1 I External Interrupt Request #2 BR 2 1 I External Bus Request Input BG 1 O External Bus Grant Output PMS 1 O External Program Memory Select DMS 1 O External Data Memory Select BMS 1 O Boot Memory Select RD 1 O External Memory Read Enable WR 1 O External Memory Write Enable MMAP 1 I Memory Map Select Input CLKIN, XTAL 2 I External Clock or Quartz Crystal Input CLKOUT 1 O Processor Clock Output VDD Power Supply Pins GND Ground Pins SPORT0 5 I/O Serial Port 0 Pins (TFS0, RFS0, DT0, DR0, SCLK0) SPORT1 5 I/O Serial Port 1 Pins (TFS1, RFS1, DT1, DR1, SCLK1) or Interrupts & Flags: IRQ0 (RFS1) 1 I External Interrupt Request #0 IRQ1 (TFS1) 1 I External Interrupt Request #1 FI (DR1) 1 I Flag Input Pin FO (DT1) 1 O Flag Output Pin NOTES 1Unused data bus lines may be left floating. 2BR must be tied high (to V DD) if not used. |
Similar Part No. - ADSP-2109LKP-55 |
|
Similar Description - ADSP-2109LKP-55 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |