MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 336

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Programmable Interrupt Timer (PIT)
20.4 Functional Description
Advance Information
336
PIT Status and Control Register
Register Name
PIT Counter Register High
PIT Counter Register Low
BUS CLOCK
INTERNAL
CSTOP
CRST
(PCNTH)
TIMPMODH:TIMPMODL
(PCNTL)
16-BIT COMPARATOR
16-BIT COUNTER
(PSC)
Figure 20-1
PIT is the 16-bit PIT counter that can operate as a free-running counter
or a modulo up-counter. The counter provides the timing reference for
the interrupt. The PIT counter modulo registers, PMODH–PMODL,
control the modulo value of the counter. Software can read the counter
value at any time without affecting the counting sequence.
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
PRESCALER
Freescale Semiconductor, Inc.
•
Figure 20-2. PIT I/O Register Summary
For More Information On This Product,
PIT Counter Stop and Reset Bits
Figure 20-1. PIT Block Diagram
Bit 7
Bit 15
POF
Bit 7
Programmable Interrupt Timer (PIT)
0
0
0
0
shows the structure of the PIT. The central component of the
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=Unimplemented
POIE
14
6
0
0
6
0
PPS2
PRESCALER SELECT
PSTOP
13
5
1
0
5
0
PPS1
PRST
PPS0
12
4
0
0
0
4
0
11
3
0
0
0
3
0
POIE
POF
68HC908AZ32A — Rev 0.0
PPS2
10
2
0
0
2
0
INTER-
LOGIC
RUPT
PPS1
1
0
9
0
1
0
MOTOROLA
Bit 0
PPS0
Bit 8
Bit 0
0
0
0