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参数资料
| 型号： | ST90135M5T6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | PLASTIC, TQFP-80 |
| 文件页数： | 49/199页 |
| 文件大小： | 3266K |
| 代理商： | ST90135M5T6 |
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ST90158 - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont’d)
9.5.9 Register Description
It is possible to have up to 3 independent SPIs in
the same device (refer to the device block dia-
gram). In this case they are named SPI0 thru
SPI2. If the device has one SPI converter it uses
the register adresses of SPI0. The register map is
the following:
Note: In the register description on the following
pages, register and page numbers are given using
the example of SPI0.
SPI DATA REGISTER (SPIDR)
R253 - Read/Write
Register Page: 0
Reset Value: undefined
Bit 7:0 = D[0:7]:
SPI Data.
This register contains the data transmitted and re-
ceived by the SPI. Data is transmitted bit 7 first,
and incoming data is received into bit 0. Transmis-
sion is started by writing to this register.
Note: SPIDR state remains undefined until the
end of transmission of the first byte.
SPI CONTROL REGISTER (SPICR)
R254 - Read/Write
Register Page: 0
Reset Value: 0000 0000 (00h)
Bit 7 = SPEN:
Serial Peripheral Enable.
0: SCK and SDO are kept tristate.
1: Both alternate functions SCK and SDO are ena-
bled.
Note: furthermore, SPEN (together with the BMS
bit) affects the selection of the source for interrupt
channel B0. Transmission starts when data is writ-
ten to the SPIDR Register.
Bit 6 = BMS:
S-bus/I2C-bus Mode Selector.
0: Perform a re-initialisation of the SPI logic, thus
allowing recovery procedures after a RX/TX fail-
ure.
1: Enable S-bus/I2C-bus arbitration, clock synchro-
nization and Start/ Stop detection (SPI used in
an S-bus/I2C-bus protocol).
Note: when the BMS bit is reset, it affects (togeth-
er with the SPEN bit) the selection of the source
for interrupt channel B0.
Bit 5 = ARB:
Arbitration flag bit.
This bit is set by hardware and can be reset by
software.
0: S-bus/I2C-bus stop condition is detected.
1: Arbitration lost by the SPI in S-bus/I2C-bus
mode.
Note: when ARB is set automatically, the SDO pin
is set to a high value until a write instruction on
SPIDR is performed.
Bit 4 = BUSY:
SPI Busy Flag.
This bit is set by hardware. It allows the user to
monitor the SPI status by polling its value.
0: No transmission in progress.
1: Transmission in progress.
Bit 3 = CPOL:
Transmission Clock Polarity.
CPOL controls the normal or steady state value of
the clock when data is
not being transferred.
Please refer to the following table and to Figure 75
to see this bit action (together with the CPHA bit).
Note: As the SCK line is held in a high impedance
state when the SPI is disabled (SPEN = “0”), the
SCK pin must be connected to VSS or to VCC
through a resistor, depending on the CPOL state.
Polarity should be set during the initialisation rou-
tine, in accordance with the setting of all peripher-
als, and should not be changed during program
execution.
Register
SPIn
Page
SPIDR R253
SPI0
0
SPICR R254
SPI0
0
SPIDR1 R253
SPI1
7
SPICR1 R254
SPI1
7
SPIDR2 R245
SPI2
7
SPICR2 R246
SPI2
7
70
D7
D6
D5
D4
D3
D2
D1
D0
70
SPEN
BMS
ARB
BUSY
CPOL
CPHA
SPR1
SPR0
9
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