Datasheet

System Integration Module
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System Integration Module
8-16 MCF5206e USER’S MANUAL MOTOROLA
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The SWIVR is an 8-bit write-only register, which is set to the uninitialized vector $0F at
system reset.
8.3.2.9 SOFTWARE WATCHDOG SERVICE REGISTER (SWSR). The SWSR is the
location to which the SWT servicing sequence is written. To prevent an SWT timeout, you
should write a $55 followed by a $AA to this register. Although both writes must occur in the
order listed prior to the SWT timeout, any number of instructions or accesses to the SWSR
can be executed between the two writes. This allows interrupts and exceptions to occur, if
necessary, between the two writes.
The SWSR is an 8-bit write-only register. At system reset, the contents of SWSR are
uninitialized.
8.3.2.10 PIN ASSIGNMENT REGISTER (PAR). The PAR lets you select certain signal pin
assignments. You can select between address, chip selects and write enables, data and
parallel port signals, processor status (PST) and parallel port signals, and UART request-to-
send and reset out.
The PAR is an 8-bit read-write register. At system reset, all bits are cleared.
PAR9 - Pin Assignment Bit 9
This bit lets you select the signal input/output on the TOUT[0]/DREQ[1] pin as follows:
0 = Output Timer 0 output (TOUT[0]) signal on TOUT[0]/DREQ[1] pin
1 = Input DMA channel 1 request on TOUT
[0]/DREQ[1] pin
SWIV7 SWIV6 SWIV5 SWIV4 SWIV3 SWIV2 SWIV1 SWIV0
76543210
00001111
RESET:
Address MBAR + $42
Software Watchdog Interrupt Vector Register(SWIVR)
SWSR7 SWSR6 SWSR5 SWSR4 SWSR3 SWSR2 SWSR1 SWSR0
76543210
--------
RESET:
Software Watchdog Service Register(SWSR)
Address MBAR + $43
Write Only
PAR15 PAR14 PAR13 PAR12 PAR11 PAR10 PAR9 PAR8 PAR7 PAR6 PAR5 PAR4 PAR3 PAR2 PAR1 PAR0
1514131211109876543210
0000000000000000
RESET:
Pin Assignment register (PAR)
Address MBAR + $CA
R/W
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eescale S
emiconduct
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Freescale Semiconductor, Inc.
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