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68HC05CL48 Datasheet(PDF) 55 Page - Motorola, Inc

Part # 68HC05CL48
Description  SPECIFICATION (General Release)
PDF  145 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

68HC05CL48 Datasheet(HTML) 55 Page - Motorola, Inc

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June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
TIMER
MOTOROLA
REV 2.0
8-3
8.1.1 Counter
The key element in the programmable timer is a 16-bit, free-running counter or
counter register, preceded by a prescaler that divides the internal processor clock
by four. The prescaler gives the timer a resolution of 2.2 microseconds if the
internal bus clock is 1.8MHz. The counter is incremented during the low portion of
the internal bus clock. Software can read the counter at any time without affecting
its value.
The double-byte, free-running counter can be read from either of two locations,
$19-$1A (counter register) or $1B-$1C (counter alternate register). A read from
only the least significant byte (LSB) of the free-running counter ($1A, $1C)
receives the count value at the time of the read. If a read of the free-running
76543210
TCH
$0019
READ
TC15
TC14
TC13
TC12
TC11
TC10
TC9
TC8
WRITE
RESET
11111111
76543210
TCL
$001A
READ
TC7
TC6
TC5
TC4
TC3
TC2
TC1
TC0
WRITE
Counter Reset
RESET
11111100
76543210
ACH
$001B
READ
AC15
AC14
AC13
AC12
AT11
AC10
AC9
AC8
WRITE
RESET
11111111
76543210
ACL
$001C
READ
AC7
AC6
AC5
AC4
AC3
AC2
AC1
AC0
WRITE
Counter Reset
RESET
11111100



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