MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 248

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Programmable Interrupt Timer (PIT)
21.7.3 PIT Counter Modulo Registers
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.
248
Address: $004E:$004F
Address: $004E:$004F
Reset:
Reset:
Read:
Read:
Write:
Write:
Reset the PIT counter before writing to the PIT counter modulo registers.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Figure 21-5. PIT Counter Modulo Registers (PMODH–PMODL)
Bit 15
Bit 7
Bit 7
Bit 7
1
1
14
6
1
6
6
1
13
5
1
5
5
1
NOTE
12
4
1
4
4
1
11
3
1
3
3
1
10
2
1
2
2
1
1
9
1
1
1
1
Freescale Semiconductor
Bit 0
Bit 8
Bit 0
Bit 0
1
1