C505-2RM SIEMENS [Siemens Semiconductor Group], C505-2RM Datasheet - Page 33
C505-2RM
Manufacturer Part Number
C505-2RM
Description
8-Bit CMOS Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C505-2RM.pdf
(85 pages)
- Current page: 33 of 85
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Timer 2 Compare Modes
The compare function of a timer/register combination operates as follows : the 16-bit value stored
in a compare or compare/capture register is compared with the contents of the timer register; if the
count value in the timer register matches the stored value, an appropriate output signal is generated
at a corresponding port pin and an interrupt can be generated.
Compare Mode 0
In compare mode 0, upon matching the timer and compare register contents, the output signal
changes from low to high. lt goes back to a low level on timer overflow. As long as compare mode 0
is enabled, the appropriate output pin is controlled by the timer circuit only and writing to the port
will have no effect. Figure 12 shows a functional diagram of a port circuit when used in compare
mode 0. The port latch is directly controlled by the timer overflow and compare match signals. The
input line from the internal bus and the write-to-latch line of the port latch are disconnected when
compare mode 0 is enabled.
Figure 12
Port Latch in Compare Mode 0
Semiconductor Group
Compare Register
Timer Register
Compare Reg.
Timer Circuit
Comparator
Circuit
16 Bit
16
Bit
Compare
Match
Overflow
Timer
Port Circuit
Internal
Bus
Write to
Latch
33
S
D
CLK
R
Latch
Port
Read Latch
Read Pin
Q
Q
C505A / C505CA
C505 / C505C
V
CC
MCS02661
1997-12-01
Port
Pin
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