Chapter 10 Clock Output/Buzzer Output Controller; Functions Of Clock Output/Buzzer Output Controller - NEC mPD780024AS Series Preliminary User's Manual

CHAPTER 10 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER

10.1 Functions of Clock Output/Buzzer Output Controller

The clock output controller is intended for carrier output during remote controlled transmission and clock output
for supply to peripheral LSIs. The clock selected with the clock output select register (CKS) is output.
In addition, the buzzer output is intended for square wave output of buzzer frequency selected with CKS.
Figure 10-1 shows the block diagram of clock output/buzzer output controller.
Figure 10-1. Block Diagram of Clock Output/Buzzer Output Controller
BZOE
Prescaler
f
X
8
f
XT
BCS1 BCS0 CLOE CCS3
Clock output select register (CKS)
Internal bus
Preliminary User's Manual U16035EJ1V0UM
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f /2 to f /2
X X
4
BZOE
7
f to f /2
X X
Clock
controller
CLOE
CCS2 CCS1 CCS0
BUZ/P75
BCS0, BCS1
PCL/P74
165