NEC PD17062 - Manual (Page 221)

221
µ
PD17062
18.3 PROGRAMMABLE DIVIDER (PD) AND PLL MODE SELECT REGISTER
18.3.1 Programmable Divider Configuration
Fig. 18-2 shows the configuration of the programmable divider (PD).
As shown in Fig. 18-2, the programmable divider consists of a swallow counter and programmable counter.
Fig. 18-2 Programmable Divider Configuration
0CH 0DH 0EH 0FH
DBF3 DBF2 DBF1 DBF0
M
S
B
L
S
B
16
12 4
PSC
VCO
Data buffer (DBF)
Address
Symbol
Data
PLL data register
12 bits 4 bits
Swallow counter
4 bits
Programmable counter
12 bits
f N
To -DET
φ
1/2 frequency
divider
PLL disable signal