参数资料
型号: ST10R172LT6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, 50 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, TQFP-100
文件页数: 16/68页
文件大小: 657K
代理商: ST10R172LT6
23/68
ST10R172L - SERIAL CHANNELS
various commonly used baud rates together with the required reload values and the deviation
errors compared to the intended baudrate.
SSP transmits 1...3 bytes or receives 1 byte after sending 1...3 bytes synchronously to a shift
clock which is generated by the SSP. The SSP can start shifting with the LSB or with the MSB
and is used to select shifting and latching clock edges, and clock polarity. Up to two chip select
lines may be activated in order to direct data transfers to one or both of two peripheral devices.
When the SSP is enabled, the four upper pins of Port4 can not be used as general purpose
IO. Note that the segment address selection done via the system start-up configuration during
reset has priority and overrides the SSP functions on these pins.
S0BRS = ‘0’, fCPU = 50MHz
S0BRS = ‘1’, fCPU = 50MHz
Baud Rate
(Baud)
Deviation Error
Reload Value
Baud Rate
(Baud)
Deviation Error
Reload Value
1562500
0.0%
/ 0.0%
0000H / 0000H
1041666
0.0%
/ 0.0%
0000H / 0000H
56000
+3.3%
/ -0.4%
001AH / 001BH
56000
+3.3%
/ -2.1%
0011H / 0012H
38400
+1.7%
/ -0.8%
0027H / 0028H
38400
+0.5%
/ -3.1%
001AH / 001BH
19200
+0.5%
/ -0.8%
0050H / 0051H
19200
+0.5%
/-1.4%
0035H / 0036H
9600
+0.5%
/ -0.1%
00A1H/ 00A2H
9600
+0.5%
/ -0.5%
006BH / 006CH
4800
+0.2%
/ -0.1%
0144H / 0145H
4800
0.0%
/ -0.5%
00D8H / 00D9H
2400
0.0%
/ -0.1%
028AH / 028BH
2400
0.0%
/ -0.2%
01B1H / 01B2H
1200
0.0%
/ -0.1%
0515H / 0516H
1200
0.0%
/ -0.1%
0363H / 0364H
600
0.0%
/ 0.0%
0A2BH / 0A2CH 600
0.0%
/ -0.1%
06C7H / 06C8H
190
+0.4%
/+0.4%
1FFFH / 1FFFH
75
0.0%
/ 0.0%
363FH / 3640H
127
+0.1%
/ +0.1% 1FFFH / 1FFFH
Table 7 Commonly used baud rates, required reload values and deviation errors
SSPCKS Value
Synchronous baud rate
000
SSP clock = CPU clock divided by 2
25 MBit/s
001
SSP clock = CPU clock divided by 4
12.5 MBit/s
010
SSP clock = CPU clock divided by 8
6.25 MBit/s
Table 8 Synchronous baud rate and SSPCKS reload values
1
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