Motorola MC68340 manual POT Encoding, MODEx Encoding, Division, Selected Clock, TOUTx Mode

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

POT2–POT0—Prescaler Output Tap

If PCLK is set, these bits encode which of the prescaler's output taps act as the counter clock. A division of the selected clock is applied to the counter as listed in Table 8-4.

Table 8-4. POT Encoding

			Division of
POT2	POT1	POT0	Selected Clock
0	0	1	Divide by 2
0	1	0	Divide by 4
0	1	1	Divide by 8
1	0	0	Divide by 16
1	0	1	Divide by 32
1	1	0	Divide by 64
1	1	1	Divide by 128
0	0	0	Divide by 256

MODE2–MODE0—Operation Mode

These bits select one of the eight modes of operation for the timer as listed in Table 8-5. Refer to 8.3 Operating Modes for more information on the individual modes.

Table 8-5. MODEx Encoding

MODE2	MODE1	MODE0	OPERATION MODE
0	0	0	Input Capture/Output Compare
0	0	1	Square-Wave Generator
0	1	0	Variable Duty-Cycle Square-Wave Generator
0	1	1	Variable-Width Single-Shot Pulse Generator
1	0	0	Pulse-Width Measurement
1	0	1	Period Measurement
1	1	0	Event Count
1	1	1	Timer Bypass (Simple Test Mode)

OC1–OC0—Output Control

These bits select the conditions under which TOUTx changes (see Table 8-6). These bits may have a different effect when in the input capture/output compare mode. Caution should be used when modifying the OC bits near timer events.

Table 8-6. OCx Encoding

OC1	OC0	TOUTx MODE
0	0	Disabled
0	1	Toggle Mode
1	0	Zero Mode
1	1	One Mode

8- 22MC68340 USER’S MANUALMOTOROLA

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