PRELIMINARY
Programmable Divide (N Counter)
The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter). If the
Control Bits are 10 or 11 (10 for IF counter and 11 for RF counter) data is transferred from the 22-bit shift register into a 4-
bit or 7-bit latch (which sets the Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter),
MSB first. Serial data format is shown below. For the IF N counter bits 5, 6, and 7 are don’t care bits. The RF N counter
does not have don’t care bits.
ꢀꢁꢂ
ꢃꢁꢂ
ꢀꢁ ꢀꢂ
ꢞ
ꢁ
ꢞ
ꢂ
ꢞ
ꢄ
ꢞ
ꢅ
ꢞ
ꢆ
ꢞ
ꢇ
ꢞ
ꢈ
ꢞ
ꢉ
ꢞ
ꢊ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢞ
ꢁꢋ
ꢁꢁ
ꢁꢂ
ꢁꢄ
ꢁꢅ
ꢁꢆ
ꢁꢇ
ꢁꢈ
ꢁꢉ
ꢁꢊ
ꢂꢋ
ꢌꢀꢍꢎꢏꢐꢍꢑꢒꢓꢔꢏꢕꢖ
ꢗꢐꢍꢘꢐꢙꢚ
ꢔ!ꢔꢜꢝꢒꢐꢙꢏꢔꢍꢒꢍ"ꢒꢏ#ꢝꢒ$ꢐꢍꢘꢐꢙꢚꢚꢙꢓꢑꢝꢒꢜꢔ!ꢔꢜꢝꢐ%ꢒꢞ
7-Bit Swallow Counter Divide Ratio (A Counter)
RF
IF
DIVIDE
N
7
N
6
N
5
N
4
N
3
N
2
N
1
DIVIDE
N
7
N
N
5
N
N
3
N
2
N
1
RATIO A
RATIO A
6
X
X
•
4
0
0
•
0
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
1
•
0
1
X
X
•
X
X
•
0
0
•
0
0
•
0
1
•
1
•
•
127
1
1
1
1
1
1
1
15
X
X
X
1
1
1
1
NOTES:
X = Don’t care condition
1. Divide ratio 0 to 127
2. B ꢀA
11-Bit Programmable Counter Divide Ratio (B Counter)
DIVIDE
N
N
N
N
N
N
N
N
N
N
9
N
8
RATIO A 18
17
16
15
14
13
12
11
10
3
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
0
•
0
1
•
1
0
•
1
0
•
4
•
2047
NOTES:
1
1
1
1
1
1
1
1
1
1
1
1. Divide ratio 3 to 2047 (divide ratios less than 3 are prohibited).
2. B ꢀA
Pulse Swallow Function
fVCO = [(P ꢁB) + A] ꢁfOSC/R
f
VCO: Output frequency of external voltage controlled oscillator (VCO)
B: Preset divide ratio of binary 11-bit programmable counter (3 to 2047)
A: Preset divide ratio of binary 7-bit swallow counter (0ꢂAꢂ127 {RF}, 0ꢂAꢂ15 {IF}, AꢂB)
OSC: Output frequency of the external reference frequency oscillator
f
R: Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)
P: Preset modulus of dual modulus prescaler (for IF: P=8 or 16; for RF: P=64 or 128)
ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ
ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢇ ꢉ
ꢇ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ