STV0299B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV0299B' PDF : 36 Pages View PDF
STV0299B
5 REGISTER LIST (continued)
Name
HEX Reset Bit
Address Value Position
Signal Description
AUXILIARY CLOCK REGISTER (refer to Section 4.1.8 on page 8)
ACR
03
2A
[7:0] ACR Prescaler and Divider
This register is made up of the ACR [7:5] Prescaler field and the ACR
[4:0] Divider field. The values in these fields configure the auxiliary
clock function, the prescalar value, the clock signal frequency.
The frequency range is given for fVCO = 400 MHz.
ACR [7:0] Function Prescaler
Signal Frequency
Range
000XXXX0
Output
Port
N/A
output port = 0
N/A
000XXXX1
Output
Port
N/A
output port = 1
N/A
001XXXXX
HF
generator
1
fVCO/8/ACR[4:0]
1.6 to
50 MHz
010XXXXX
LF
generator
64
fVCO/8192/(32+ACR[4:0])
775 to
1525 Hz
011XXXXX
LF
generator
128
fVCO/16384/(32+ACR[4:0])
388 to
762 Hz
100XXXXX
LF
generator
256
fVCO/32768/(32+ACR[4:0])
194 to
381 Hz
101XXXXX
LF
generator
512
fVCO/65536/(32+ACR[4:0])
97 to
190 Hz
110XXXXX
LF
generator
1024
fVCO/131072/(32+ACR[4:0])
49 to
95 Hz
111XXXXX
LF
generator
2048
fVCO/262144/(32+ACR[4:0])
24 to
47 Hz
In the LF generator, the programmable division factor is
32 + ACR[4:0]. In the HF generator, it is simply ACR[4:0]. This allows
the building of any frequency from 24 Hz to 1.1 kHz (within ±1.5%) in
the full operating range. The output signal is square in all cases.
When the auxiliary register is written, the prescaler and the program-
mable divider are reset.
F22 FREQUENCY REGISTER (refer to Section 4.1.8 on page 8)
F22FR
04
8E
[7:0] The actual frequency is fVCO/(128 R[7:0]). When this register is
accessed, the divider by 16 (also common to AUX_CLK) and the
divider by R[7:0] are initialized.
I2CRPT REGISTER (refer To Section 4.1.10 on page 10)
I2CRPT
05
0F
7 I2CT
1: I2C repeater
0: Output port
[6] Must be programmed to zero.
[5:4] Repeater response time; value does not matter if the external time
constant ≤ 250ns.
[3] Must be programmed to zero.
2 SCLT Port value
1 This bit must be programmed to zero.
0 SDAT Port value
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