UPD784938 Datasheet, PDF (511/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 21 CLOCK OUTPUT FUNCTION
The µPD784938 has a clock function that outputs a signal scaled from the system clock.
The clock output function can output the system clock directly, or a 1/2, 1/4, 1/8, or 1/16 system clock signal. In addition,
it can be used as a 1-bit output port. The output pin has a alternate function as the ASTB pin.
Caution This function cannot be used when the external memory expansion mode is used.
21.1 Configuration
The clock output function configuration is shown in Figure 21-1.
Figure 21-1. Clock Output Function Configuration
LV
0
0
CLE
0
FS2
FS1
FS0
Clock output mode
register (CLOM)
fCLK
fCLK/2
fCLK/4
fCLK/8
fCLK/16
Selector 1
Output
control
Address latch signal
Selector 2
RESET
ASTB/CLOCKOUT
Preliminary User’s Manual U13987EJ1V0UM00
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