- 您现在的位置：买卖IC网 > PDF目录98144 > ST6367B1/XXX (STMICROELECTRONICS) 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 PDF资料下载
参数资料
| 型号： | ST6367B1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | SHRINK, PLASTIC, DIP-42 |
| 文件页数： | 38/84页 |
| 文件大小： | 861K |
| 代理商： | ST6367B1/XXX |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页当前第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页
43/84
ST6365, ST6375, ST6385 ST6367, ST6377, ST6387
4.4 14-BIT VOLTAGE SYNTHESIS TUNING PERIPHERAL
The ST638x on-chip voltage synthesis tuning pe-
ripheral has been integrated to allow the genera-
tion of tuning reference voltage in low/mid end TV
set applications. The peripheral is composed of a
14-bit counter that allows the conversion of the
digital content in a tuning voltage, available at the
VS output pin, by using Pulse Width Modification
(PWM), and Bit Rate Multiplier (BRM) techniques.
The 14-bit counter gives 16384 steps which allows
a resolution of approximately 2mV over a tuning
voltage of 32V; this corresponds to a tuning reso-
lution of about 40KHz per step in the UHF band
(the actual value will depend on the characteristics
of the tuner).
The tuning word consists of a 14-bit word con-
tained in the registers VSDATA1 (location 0EEh)
and VSDATA2 (location 0EFh). Coarse tuning
(PWM) is performed using the seven MSBits,
while fine tuning (BRM) is performed using the
data in the seven LSBits. With all zeros loaded the
output is zero; as the tuning voltage increases
from all zeros, the number of pulses in one period
increase to 128 with all pulses being the same
width. For values larger than 128, the PWM takes
over and the number of pulses in one period re-
mains constant at 128, but the width changes. At
the other end of the scale, when almost all ones
are loaded, the pulses will start to link together and
the number of pulses will decrease. When all ones
are loaded, the output will be almost 100% high
but will have a low pulse (1/16384 of the high
pulse).
4.4.1 Output Details
Inside the on-chip Voltage Synthesis are included
the register latches, a reference counter, PWM
and BRM control circuitry. In the ST638x the clock
for the 14-bit reference counter is 2MHz derived
from the 8MHz system clock. From the circuit point
of view, the seven most significant bits control the
coarse tuning, while the seven least significant bits
control the fine tuning. From the application and
software point of view, the 14 bits can be consid-
ered as one binary number.
As already mentioned the coarse tuning consists
of a PWM signal with 128 steps; we can consider
the fine tuning to cover 128 coarse tuning cycles.
The addition of pulses is described in the following
Table.
Table 13. . Fine Tuning Pulse Addition
The VS output pin has a standard drive push-pull
output configuration.
4.4.2 VS Tuning Cell Registers
Voltage Synthesis Data Register 1 (VSDR1)
Address: EEh - Write only
Reset Value: XXh
Caution: This register contains at least one write
only bit. Single bit instructions (SET, RES, INC
and DEC) should not be used.
D7-D0. These are the 8 least significant VS data
bits. Bit 0 is the LSB. This register is undefined on
reset.
Voltage Synthesis Data Register 2 (VSDR2)
Address: EFh - Write only
Reset Value: XXh
Caution: This register contains at least one write
only bit. Single bit instructions (SET, RES, INC
and DEC) should not be used.
D7-D6. These bits are not used.
D5-D0. These are the 6 most significant VS data
bits. Bit 5 is the MSB. This register is undefined on
reset.
Fine Tuning
(7 LSB)
N° of pulses added at the
following cycles
(0... 127)
0000001
64
0000010
32, 96
0000100
16, 48, 80, 112
0001000
8, 24,....104, 120
0010000
4, 12,....116, 124
0100000
2, 6,.....122, 126
1000000
1, 3,.....125, 127
70
VSDR1
7
VSDR1
6
VSDR1
5
VSDR1
4
VSDR1
3
VSDR1
2
VSDR1
1
VSDR1
0
70
--
VSDR2
5
VSDR2
4
VSDR2
3
VSDR2
2
VSDR2
1
VSDR2
0
相关PDF资料 |
PDF描述 |
|---|---|
| ST6382B1/XXX | 8-BIT, MROM, MICROCONTROLLER, PDIP42 |
| ST6386B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6388B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6387B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6394B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST6369 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR |
| ST6369B1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| ST6-36B28 | 功能描述:电源变压器 SPLIT BOBBIN HORZ MOUNT XFMR RoHS:否 制造商:Triad Magnetics 功率额定值:12 VA 初级电压额定值:115 V / 230 V 次级电压额定值:12 V / 24 V 安装风格:SMD/SMT 一次绕组:Dual Primary Winding 二次绕组:Dual Secondary Winding 长度:2.5 in 宽度:2 in 高度:1.062 in |
| ST6371 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| ST6372 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
发布紧急采购，3分钟左右您将得到回复。