NEC PD75P402, PD75402A user manual Peripheral Hardware Functions Clock Output Circuit

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

5.3CLOCK OUTPUT CIRCUIT

The clock output circuit outputs clock pulses from the P22/PCL pin, and is used to supply clock pulses to peripheral

LSIs, etc.

5.3.1Clock Output Circuit Configuration

The configuration of the clock output circuit is shown in Fig. 5-18.

Fig. 5-18 Clock Output Circuit Configuration

From Clock

Generation

Circuit

Φ￿

fXX/2 6

Selector

Output

Buffer

P22/PCL

CLOM3

0

CLOM1 CLOM0 CLOM

PORT2.2

P22

Output

Latch

PMGB Bit 2

Port 2 Input/

Output Mode

Specification Bit

4

Internal Bus

Remarks When switching between clock output enabled/disabled states, consideration has been given to ensuring

that a short pulse is not output.

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