mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 367

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

When the PCSRn[OVW] bit is set, counter can be directly initialized by writing to PMRn without having
to wait for the count to reach 0x0000.
19.3.3
The 16-bit PIT counter and prescaler supports different timeout periods. The prescaler divides the internal
bus clock period as selected by the PCSRn[PRE] bits. The PMRn[PM] bits select the timeout period.
19.3.4
Table 19-6
The PIF flag is set when the PIT counter reaches 0x0000. The PIE bit enables the PIF flag to generate
interrupt requests. Clear PIF by writing a 1 to it or by writing to the PMR.
Freescale Semiconductor
PIT CLOCK
MODULUS
COUNTER
PIF
shows the interrupt request generated by the PIT.
Timeout Specifications
Interrupt Operation
0x0002
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Timeout period
Interrupt Request
Figure 19-6. Counter in Free-Running Mode
Timeout
Table 19-6. PIT Interrupt Requests
=
2
----------------------------------------------------------------------- -
0x0001
PCSRn[PRE]
×
f
0x0005
(PMRn[PM]
sys
Flag
PIF
+
0x0000
1)
Enable Bit
Programmable Interrupt Timers (PIT0–PIT3)
PIE
0xFFFF
Eqn. 19-1
19-7