SPMC68CK338CPV14 datasheet(97/133 Pages) FREESCALE

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MC68CK338

MOTOROLA

MC68CK338TS/D

SDATA and SDATB are the data registers associated with SASM channels A and B, respectively. In IC

mode, SDATA and SDATB contain the last captured value. In the OC, OCT and OP modes, SDATA

and SDATB are loaded with the value of the next output compare.

6.10 Double-Action Submodule (DASM)

The double-action submodule (DASM) provides two 16-bit input capture or two 16-bit output compare

functions that can occur automatically without software intervention. The input edge detector is pro-

grammable to cause the capture function to occur on user-specified edges. The output flip flop is set by

one of the output compare signals and reset by the other one. The DASM input capture and the output

compare modes may optionally generate interrupts. Software determines which of the two incoming

time-base buses is used for input captures or output compares.

Six operating modes allow software to use DASM input capture and output compare functions to per-

form pulse-width measurement, period measurement, single pulse generation, and continuous pulse

width modulation, as well as standard input capture and output compare. The DASM can also work as

a single I/O pin. DASM operation is determined by the mode select bit field MODE[3:0] in the DASM

status/interrupt/control (DASMSIC) register. Table 58 shows the different DASM modes of operation.

Table 57 SASM Operating Mode Select

MODE1

MODE2

SASM Channel Operating Mode

Input capture (IC)

Output port (OP)

Output compare (OC)

Output compare and toggle (OCT)

S12DATA, S14DATA — SASM Data Register A

$YFF462, $YFF472

S18DATA, S24DATA — SASM Data Register A

$YFF492, $YFF4C2

RESET:

S12DATB, S14DATB — SASM Data Register B

$YFF464, $YFF474

S18DATB, S24DATB — SASM Data Register B

$YFF494, $YFF4C4

RESET:

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