XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 351

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

21.8.3 PIT Counter Modulo Registers
MC68HC908AZ60A — Rev 2.0
MOTOROLA
NOTE:
Address: $004E:$004F
Address: $004E:$004F
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 timer 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:
Read:
Read:
Write:
Write:
Figure 21-5. PIT Counter Modulo Registers (PMODH–PMODL)
Bit 15
Bit 7
Bit 7
Bit 7
Programmable Interrupt Timer (PIT)
1
1
14
6
1
6
6
1
13
5
1
5
5
1
12
4
1
4
4
1
Programmable Interrupt Timer (PIT)
11
3
1
3
3
1
10
2
1
2
2
1
1
9
1
1
1
1
Technical Data
I/O Registers
Bit 0
Bit 8
Bit 0
Bit 0
1
1
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