NEC PD75402A Manuale Utente
63
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
5.3
CLOCK 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.
5.3.1
Clock Output Circuit Configuration
The configuration of the clock output circuit is shown in Fig. 5-18.
Fig. 5-18 Clock Output Circuit Configuration
Remarks
When switching between clock output enabled/disabled states, consideration has been given to ensuring
that a short pulse is not output.
From Clock
Generation
Circuit
Generation
Circuit
Φ
f
XX
/2
6
Selector
CLOM0
CLOM1
CLOM3
CLOM
4
0
Internal Bus
P22/PCL
PMGB Bit 2
Port 2 Input/
Output Mode
Specification Bit
Output Mode
Specification Bit
P22
Output
Latch
Output
Latch
PORT2.2
Output
Buffer
Buffer