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C505_9708 Datasheet(PDF) 88 Page - Siemens Semiconductor Group

Part No. C505_9708
Description  8-Bit CMOS Microcontroller
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

C505_9708 Datasheet(HTML) 88 Page - Siemens Semiconductor Group

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Semiconductor Group
6-26
1997-08-01
On-Chip Peripheral Components
C505 / C505C
The T2CON timer 2 control register is a bit-addressable register which controls the timer 2 function
and the compare mode of registers CRC, CC1 to CC3.
Special Function Register T2CON (Address C8H)
Reset Value : 00X00000B
Bit
Function
T2PS
Prescaler select bit
When set, timer 2 is clocked in the “timer“ or “gated timer“ function with 1/12 of the
oscillator frequency. When cleared, timer 2 is clocked with 1/6 of the oscillator
frequency. T2PS must be 0 for the counter operation of timer 2.
I3FR
External interrupt 3 falling / rising edge flag
Used for capture function in combination with register CRC. If set, a capture to
register CRC (if enabled) will occur on a positive transition at pin P1.0/AN0/INT3/
CC0
T2R1
T2R0
Timer 2 reload mode selection
T2CM
Compare mode bit for registers CRC, CC1 through CC3
When set, compare mode 1 is selected. T2CM = 0 selects compare mode 0.
T2I1
T2I0
Timer 2 input selection
CFH
CEH
CDH
CCH
CBH
CAH
C9H
C8H
T2PS
I3FR
T2R1
C8H
T2CON
Bit No.
76543210
MSB
LSB
T2R0
T2CM
T2I1
T2I0
The shaded bits are not used for controlling timer/counter 2.
T2R1
T2R0
Function
0
X
Reload disabled
1
0
Mode 0 : auto-reload upon timer 2 overflow (TF2)
1
1
Mode 1 : reload on falling edge at pin P1.5 / AN5 / T2EX
T2I1
T2I0
Function
0
0
No input selected, timer 2 stops
0
1
Timer function :
input frequency = fosc/6 (T2PS = 0) or fosc/12 (T2PS = 1)
1
0
Counter function :
external input signal at pin P1.7 / AN7 / T2
1
1
Gated timer function :
input controlled by pin P1.7 / AN7 / T2


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