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ST18952 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte ST18952
Spiegazioni elettronici  DIGITAL SIGNAL PROCESSOR DSP CHIP
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST18952
Table 2.4
General purpose parallel port / Interrupt requests (8 pins)
Table 2.5
Clocks (6 pins)
Table 2.6
Bus control (3 pins)
Pin name
Type
Description
P_ITRQ0-7
I/O
Multiplexed input/output. Parallel port I/O or external interrupt request (ITRQ).
Pin name
Type
Description
EXTAL
I
Oscillator input.
XTAL
O
Oscillator output. Nominal oscillator frequency is 27 MHz.
MCLK
I
Master clock input (use of external clock generator).
CLK_MODE
I
Clock mode select input.
When low the oscillator and internal PLL are enabled. The 950 receives its
Master clock from the PLL at 5 times the oscillator frequency.
When high the PLL is disabled. The D950 receives its master clock from
MCLK.
INCYCLE
O
Instruction cycle.
Asserted high for 1 CLKOUT cycle at the beginning of instruction cycle.
CLKOUT
O
Output clock (at input clock/2 frequency).
Pin name
Type
Description
DTACK
I
Data transfer acknowledge input. Active low.
It is combined in a OR gate with BSU DTACK output in order to generate the
DTACK signal for the D950Core. It controls extension of bus cycles by inser-
tion of wait-states when using external memory either through Bus-switch or
direct extension.
HOLD
I
External Bus Hold request input. Active low.
HOLDACK
O
Hold acknowledge output. Active low.


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