MC68HC908AS32A Datasheet, PDF (149/280 Pages) Freescale Semiconductor, Inc – Microcontrollers

I/O Registers
Address: $004D
Bit 7
6
5
4
3
2
Read: Bit 15
14
13
12
11
10
Write:
1
Bit 0
9
Bit 8
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 12-3. PIT Counter Registers (PCNTH–PCNTL) (Continued)
12.7.3 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.
Address: $004E
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
14
13
12
11
10
Write:
9
Bit 8
Reset: 1
1
1
1
1
1
1
1
Address: $004F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset: 1
1
1
1
1
1
1
1
Figure 12-4. PIT Counter Modulo Registers (PMODH–PMODL)
NOTE
Reset the PIT counter before writing to the PIT counter modulo registers.
MC68HC908AS32A Data Sheet, Rev. 2.0
Freescale Semiconductor
149