MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 228

• Manufacturer Part Number: MC68HC908AB32
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Programmable Interrupt Timer (PIT)
13.7.3 PIT Counter Modulo Registers
Technical Data
228
NOTE:
Address:
Address:
Address:
The read/write PIT modulo registers contain the modulo value for the PIT
counter. When the PIT counter reaches the modulo value, the overflow
flag (POF) becomes set, and the PIT counter resumes counting from
$0000 at the next clock. Writing to the high byte (PMODH) inhibits the
POF bit and overflow interrupts until the low byte (PMODL) is written.
Reset sets the PIT counter modulo registers.
Reset the PIT counter before writing to the PIT counter modulo registers.
Reset:
Reset:
Reset:
Read:
Write:
Read:
Write:
Read:
Write:
Freescale Semiconductor, Inc.
Figure 13-6. PIT Counter Modulo Register High (PMODH)
Figure 13-7. PIT Counter Modulo Register Low (PMODL)
For More Information On This Product,
$004D
$004E
$004F
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Programmable Interrupt Timer (PIT)
Figure 13-5. PIT Counter Register Low (PCNTL)
0
1
1
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= Unimplemented
14
6
6
0
6
1
6
6
1
13
5
5
0
5
1
5
5
1
12
4
4
0
4
1
4
4
1
11
3
3
0
3
1
3
3
1
MC68HC908AB32
10
2
2
0
2
1
2
2
1
1
1
0
1
9
1
1
1
1
MOTOROLA
—
Rev. 1.0
Bit 0
Bit 0
Bit 0
Bit 8
Bit 0
Bit 0
0
1
1