mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 744

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Functional Description
The internal registers of them are buffered and any values written to them are written first
to their buffers. The circumstances that cause their internal registers to be updated with
the values from the buffers are summarized as below table.
After 1 is written to SC[LDOK], the buffers cannot be written until the values in buffers
are loaded into their internal registers. SC[LDOK] is self-cleared when the internal
registers are loaded, so the application code can read it to determine the updates of the
internal registers.
The following diagrams show the cases of the internal registers being updated with
SC[LDMOD] is 00 and x1.
744
00
01
10
11
• PDB Modulus Register (MOD)
• PDB Interrupt Delay Register (IDLY)
• PDB Channel n Delay m Register (CHnDLYm)
• DAC Interval x Register (DACINTx)
• PDB Pulse-Out y Delay Register (POyDLY)
PDB Counter
SC[LDOK]
Ch n pre-trigger 0
Ch n pre-trigger 1
CHnDLY1
CHnDLY0
Table 33-44. Circumstances of Update to the Delay Registers
Figure 33-44. Registers Update with SC[LDMOD] = 00
SC[LDMOD]
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
The internal registers are loaded with the values from their
buffers immediately after 1 is written to SC[LDOK].
The PDB counter reaches the MOD register value after 1 is
written to SC[LDOK].
A trigger input event is detected after 1 is written to
SC[LDOK].
Either the PDB counter reaches the MOD register value, or a
trigger input event is detected, after 1 is written to SC[LDOK].
Update to the Delay Registers
Freescale Semiconductor, Inc.