Fujitsu F2 MC-8FX Family, Hardware Manual

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CHAPTER 17 16-BIT PPG TIMER
17.5.1 16- bit PPG Down Counter Registers (PDCRH0, PDCRL0)
The 16-bit PPG down counter registers (PDCRH0, PDCRL0) form a 16-bit register which
is used to read the count value from the 16-bit PPG down-counter.
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16-bit PPG Down Counter Registers (PDCRH0, PDCRL0)
Figure 17.5-2 16-bit PPG Down Counter Registers (PDCRH0, PDCRL0)
These registers form a 16-bit register which is used to read the count value from the 16-bit down-counter.
The initial values of the register are all "0".
Always use one of the following procedures to read from this register.
• Use the "MOVW" instruction (use a 16-bit access instruction to read the PDCRH0 register address).
• Use the "MOV" instruction and read PDCRH0 first and PDCRL0 second (reading PDCRH0
automatically copies the lower 8 bits of the down-counter to PDCRL0).
These registers are read-only and writing has no effect on the operation.
Note:
If you use the "MOV" instruction and read PDCRL0 before PDCRH0, PDCRL0 will return the value
from the previous valid read operation. Therefore, the value of the 16-bit down-counter will not be
read correctly.
R/WX: Read only (Readable, writing has no effect on operation)
16-bit PPG down counter register (upper) PDCRH0
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Initial value
0FAA
H
PDCRH0 DC15 DC14 DC13 DC12 DC11 DC10 DC09 DC08 00000000
B
R/WX R/WX R/WX R/WX R/WX R/WX R/WX R/WX
16-bit PPG down counter register (lower) PDCRL0
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Initial value
0FAB
H
PDCRL0 DC07 DC06 DC05 DC04 DC03 DC02 DC01 DC00 00000000
B
R/WX R/WX R/WX R/WX R/WX R/WX R/WX R/WX