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TS68HC901CP5 Arkusz danych(PDF) 8 Page - STMicroelectronics

Numer części TS68HC901CP5
Szczegółowy opis  HCMOS MULTI-FUNCTION PERIPHERAL
Download  42 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS68HC901CP5 Arkusz danych(HTML) 8 Page - STMicroelectronics

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interrupt structure is not implemented, the IEI of all
CMFPs must be tied low.
When the processor initiates an interrupt acknow-
ledge cycle by driving IACK and DS, the CMFP
whose IEI is low may respond with a vector number
if interrupt is pending. If this device does not have a
pending interrupt, IEO is asserted which allows the
next lower priority device to respond to the interrupt
acknowledge. When an CMFP propagates IEO, it
will not drive the data bus nor DTACK during the in-
terrupt acknowledge cycle. The timing for an IACK
cycle is shown in figure 23 and 24.
RESET OPERATION
The reset operation will initialize the CMFP to a
known state. The reset operation requires that the
RESET input be asserted for a minimum of two
microseconds. During a device reset condition, all
internal CMFP registers are cleared except for the
timer data registers (TADR, TBDR, TCDR and
TDDR), the USART data register (UDR), the trans-
mitter status register (TSR) and the interrupt vector
register. All timers are stopped and the USART re-
ceiver and transmitter are disabled. The interrupt
channels are also disabled and any pending inter-
rupts are cleared. In addition, the general purpose
interrupt I/O lines are placed in the high- impedance
input mode and the timer outputs are driven low. Ex-
ternal CMFP signals are negated. The interrupt vec-
tor register is initialized to a 0Fh.
NON MULTIPLEXED MODE
In this mode, the MPX input must be set to zero, and
the TS68HC901 can be used with a 68000 proces-
sor type or a 6800 processor type. Refer to figure 21
to 24 for the electrical characteristics.
With a 6800 processor type the DS pin is connected
to the E signal of the processor, the DTACK signal
is not used and the CLK must be zeroed.
MULTIPLEXED MODE
The CMFP can be used either on a MOTOROLA or
INTEL bus type. In this case the MPX pin is connec-
ted to Vcc. The table page 4 gives the signification
of the different signals used. A dummy access to the
TS68HC901 has to be done before any valid access
in order to set up the internal logic of sampling.
®
TS68HC901
8/42


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