MC145173 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC145173 Datasheet PDF : 33 Pages
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PROGRAMMER’S GUIDE (continued)
MOST
SIGNIFICANT NIBBLE
(SHIFTED IN FIRST)
R REGISTER
Write Only
LEAST
SIGNIFICANT NIBBLE
(SHIFTED IN LAST)
R23 R22 R21 R20 R19 R18 R17 R16 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
POL RST
K STBY
OUT D ACQ
HF/VHF
φdet1 φdet0
F SMPL MSB OF R
COUNTER
POL = Polarity of Phase Detector Outputs
DIVIDE VALUE
0 = Normal (default)
1 = Inverted
RST = Reset
0 = Normal
1 = Reset the chip (automatically cleared low)
Suggestion: set to 1 after power glitch
HF/VHF = HF or VHF Band Select
0 = HFin, HF IFin, and HF PDout pins are activated (default)
1 = VHFin, VHF IFin, and VHF PDout pins are activated
K = HF IFin Input Response
0 = Normal (must be 0 when VHF band is selected)
1 = Engage Acceptor Circuit
STBY = Standby
0 = Normal
1 = Low–Power Standby State
LSB OF R
COUNTER
DIVIDE VALUE
φdet1, φdet0 = VHF Phase Detector Response
0, 0 = Linear Response
0, 1 = Low–Gain Region or Dead Zone – 5 ns wide
1, 0 = Low–Gain Region or Dead Zone – 10 ns wide
1, 1 = Low–Gain Region or Dead Zone – 15 ns wide
Out D = Output D Pin Logic State
0 = Pin is forced to a 0 (default)
1 = Pin is forced to a 1
ACQ = Acquisition Window
0 = Narrow Sample Window
1 = Wide Sample Window
F SMPL = Frequency Counter Sample Command
0 = Initialize Counter to all 1’s (default)
1 = Sample the Frequency at HF IFin or VHF IFin pins
Example:
To program the R Counter to divide by 1000 in decimal, first convert to hexadecimal: $3E8. Then, add leading bits to form 3 bytes
(6 nibbles). The leading bits should be adjusted to control the above functions. Finally, load the R Register.
CAUTION:
When both the A/D converter and F Counter are simultaneously active, a write to the R Register causes the F Counter operation
to abort.
MOST
SIGNIFICANT NIBBLE
(SHIFTED IN FIRST)
N REGISTER
Write Only
LEAST
SIGNIFICANT NIBBLE
(SHIFTED IN LAST)
N15 N14 N13 N12
N11 N10 N9 N8
N7 N6 N5 N4
N3 N2 N1 N0
MSB OF N
COUNTER
DIVIDE VALUE
ZONE
(SEE TABLE 3)
LSB OF N
COUNTER
DIVIDE VALUE
Example:
To program the N Counter to divide by 1000 in decimal, first convert to hexadecimal: $3E8. Then, add leading zeroes to form 2 bytes
(4 nibbles): $03E8. Finally, Load the N Register with $03E8.
NOTE:
The chip’s VHF PDout is controlled by bit N15 as follows: low = low–gain region, high = dead zone. See Figure 19.
MC145173
22
MOTOROLA
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