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TS68HC901CFN4 Arkusz danych(PDF) 6 Page - STMicroelectronics

Numer części TS68HC901CFN4
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

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TAO,TBO,
TCO,TDO:
Timer Outputs. Each of the four timers
has an output which can produce a
square wave. The output will change
states each timer cycle ; thus one full pe-
riod of the timer out signal is equal to two
timer cycles. TAO or TBO can be reset
(logic ”O”) by a write to TACR, or TBCR
respectively.
XTAL1,
XTAL2 :
Timer Clock inputs. A crystal can be
connected between XTAL1 and XTAL2,
or XTAL1 can be driven with a TTL level
clock. When driving XTAL1 with a TTL le-
vel clock, XTAL2 must be allowed to float.
When using a crystal, external capacitors
are required. See figure 35. All chip ac-
cesses are independent of the timer
clock.
TAI,TBI : Timer A, B inputs. These inputs are
control signals for timers A and B in the
pulse width measurement mode and e-
vent count mode. These signals gene-
rate interrupts at the same priority level
as the general purpose I/O interrupt lines
I4 and I3, respectively. I4 and I3 do not
have interrupt capability when the timers
are operated in the pulse width measure-
ment mode or the event count mode - un-
der these conditions I4 and I3 may only
be used for I/O. Refer to paragraph TI-
MERS for further information.
Signal Name
Mnemonic
I/O
Active
Power Input
VCC
Input
High
Ground
GND
Input
Low
Clock
CLK
Input
N/A
Chip Select
CS
Input
Low
Data Strobe
DS
Input
Low
Read/Write
R/W
Input
Read-High / Write-Low
Data tranfer Acknowledge
DTACK
Output
Low
Register Select Bus
RS1-RS5
Input
N/A
Data Bus
D0-D7
I/O
N/A
Reset
RESET
Input
Low
Interrupt Request
IRQ
Output
Low
Interrupt Acknowledge
IACK
Input
Low
Interrupt Enable In
IEI
Input
Low
Interrupt Enable Out
IEO
Output
Low
General Purpose I/O - Interrupt Lines
I0-I7
I/O
N/A
Timer Clock
XTAL1, XTAL2
Input
High
Timer Inputs
TAI, TBI
Input
N/A
Timer Outputs
TAO, TBO, TCO, TDO
Output
N/A
Serial Input
SI
Input
N/A
Serial Output
SO
Output
N/A
Receiver Clock
RC
Input
N/A
Transmitter Clock
TC
Input
N/A
Receiver Ready
RR
Output
Low
Transmitter Ready
TR
Output
Low
MPX
MPX
Input
N/A
SIGNAL SUMMARY.
®
TS68HC901
6/42


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