SPMC68CK338CPV14 datasheet(93/133 Pages) FREESCALE

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MC68CK338

MOTOROLA

MC68CK338TS/D

NOTE

The clock input of MCSM2 is internally connected to I/O pin CTD27 for DASM27

and will read the state of that pin. The clock inputs of MCSM30 and MCSM31 are

internally connected to I/O pin CTD5 for DASM5 and will read the state of that pin.

The MCSM counter register is a read/write register. A read returns the current value of the counter. A

write simultaneously loads both the counter and the MCSM modulus latch with the specified value. The

counter then begins incrementing from this new value.

The MCSM modulus latch register is a read/write register. A read returns the current value of the latch.

A write pre-loads the latch with a new value that the modulus counter will begin counting from when the

next load condition occurs.

6.9 Single Action Submodule (SASM)

The single action submodule (SASM) provides two identical channels, each having its own input/output

pin, but sharing the same interrupt logic, priority level, and arbitration number. Each channel can be

configured independently to perform either input capture or output compare. Table 55 shows the differ-

ent operational modes.

NOTES:

1. When a channel is operating in IC mode, the IN bit in the SIC register reflects the logic

state of the corresponding input pin (after being Schmitt triggered and synchronized).

2. When a channel is operating in OC, OCT, or OP mode, the IN bit in the SIC register

reflects the logic state of the output of the output flip-flop.

MCSM2CNT — MCSM2 Counter Register

$YFF412

MCSM30CNT — MCSM30 Counter Register

$YFF4F2

MCSM31CNT — MCSM31 Counter Register

$YFF4FA

RESET:

MCSM2ML — MCSM2 Modulus Latch

$YFF414

MCSM30ML — MCSM30 Modulus Latch

$YFF4F4

MCSM31ML — MCSM31 Modulus Latch

$YFF4FC

RESET:

Table 55 SASM Operational Modes

Mode

Function

IC1

Input capture either on a rising or falling edge or as a read-only input port

OC2

Output compare

OCT2

Output compare and toggle

OP2

Output port

Freescale Semiconductor, Inc.

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