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| 型號： | C161S |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | 16-Bit Single-Chip Microcontroller |
| 中文描述： | 16位單片機 |
| 文件頁數(shù)： | 27/75頁 |
| 文件大?。?/td> | 1315K |
| 代理商： | C161S |
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C161S
Functional Description
Data Sheet
23
V1.0, 2003-11
3.7
Watchdog Timer
The Watchdog Timer represents one of the fail-safe mechanisms which have been
implemented to prevent the controller from malfunctioning for longer periods of time.
The Watchdog Timer is always enabled after a reset of the chip, and can only be
disabled in the time interval until the EINIT (end of initialization) instruction has been
executed. Thus, the chip
’
s start-up procedure is always monitored. The software has to
be designed to service the Watchdog Timer before it overflows. If, due to hardware or
software related failures, the software fails to do so, the Watchdog Timer overflows and
generates an internal hardware reset and pulls the RSTOUT pin low in order to allow
external hardware components to be reset.
The Watchdog Timer is a 16-bit timer, clocked with the system clock divided by 2/128.
The high byte of the Watchdog Timer register can be set to a prespecified reload value
(stored in WDTREL) in order to allow further variation of the monitored time interval.
Each time it is serviced by the application software, the high byte of the Watchdog Timer
is reloaded. Thus, time intervals between 25
μ
s and 420 ms can be monitored
(@ 20 MHz).
The default Watchdog Timer interval after reset is 6.55 ms (@ 20 MHz).
3.8
Parallel Ports
The C161S provides up to 63 I/O lines which are organized into six input/output ports
and one input port. All port lines are bit-addressable, and all input/output lines are
individually (bit-wise) programmable as inputs or outputs via direction registers. The I/O
ports are true bidirectional ports which are switched to high impedance state when
configured as inputs. The output drivers of three I/O ports can be configured (pin by pin)
for push/pull operation or open-drain operation via control registers. During the internal
reset, all port pins are configured as inputs.
All port lines have programmable alternate input or output functions associated with
them. All port lines that are not used for these alternate functions may be used as general
purpose IO lines.
PORT0 and PORT1 may be used as address and data lines when accessing external
memory, while Port 4 outputs the additional segment address bits A21/19/17
…
A16 in
systems where segmentation is enabled to access more than 64 Kbytes of memory.
Port 6 provides optional chip select signals.
Port 3 includes alternate functions of timers, serial interfaces, and the optional bus
control signal BHE.
Port 5 is used for timer control signals.
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