UPD78F0138 NEC, UPD78F0138 Datasheet - Page 247

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

11.1 Functions of Clock Output/Buzzer Output Controller
supply to peripheral LSIs. The clock selected with the clock output selection register (CKS) is output.
The clock output controller is intended for carrier output during remote controlled transmission and clock output for
In addition, the buzzer output is intended for square-wave output of buzzer frequency selected with CKS.
Figure 11-1 shows the block diagram of clock output/buzzer output controller.
BZOE
BCS1
CHAPTER 11 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
Figure 11-1. Block Diagram of Clock Output/Buzzer Output Controller
f
f
X
XT
BCS0
CLOE
Internal bus
Prescaler
8
CCS3
Clock output selection register (CKS)
f
X
to f
User’s Manual U16228EJ2V0UD
4
X
CCS2
/2
f
X
7
/2
10
to f
CCS1
X
/2
BZOE
13
CCS0
controller
CLOE
Clock
BCS0, BCS1
Output latch
(P141)
Output latch
(P140)
PM141
PM140
BUZ/BUSY0/
INTP7/P141
PCL/INTP6/P140
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