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参数资料
| 型号： | ST72121J2T6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, TQFP-44 |
| 文件页数： | 64/87页 |
| 文件大小： | 1365K |
| 代理商： | ST72121J2T6/XXX |
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ST72121
SERIAL PERIPHERAL INTERFACE (Cont’d)
STATUS REGISTER (SR)
Read Only
Reset Value: 0000 0000 (00h)
Bit 7 =
SPIF
Serial Peripheral data transfer flag.
This bit is set by hardware when a transfer has
been completed. An interrupt is generated if
SPIE=1 in the CR register. It is cleared by a soft-
ware sequence (an access to the SR register fol-
lowed by a read or write to the DR register).
0: Data transfer is in progress or has been ap-
proved by a clearing sequence.
1: Data transfer between the device and an exter-
nal device has been completed.
Note: While the SPIF bit is set, all writes to the DR
register are inhibited.
Bit 6 =
WCOL
Write Collision status.
This bit is set by hardware when a write to the DR
register is done during a transmit sequence. It is
cleared by a software sequence (see Figure 38).
0: No write collision occurred
1: A write collision has been detected
Bit 5 = Unused.
Bit 4 =
MODF
Mode Fault flag.
This bit is set by hardware when the SS pin is
pulled low in master mode (see Section 4.5.4.5
Master Mode Fault). An SPI interrupt can be gen-
erated if SPIE=1 in the CR register. This bit is
cleared by a software sequence (An access to the
SR register while MODF=1 followed by a write to
the CR register).
0: No master mode fault detected
1: A fault in master mode has been detected
Bits 3-0 = Unused.
DATA I/O REGISTER (DR)
Read/Write
Reset Value: Undefined
TheDRregister isused totransmitand receive
data on the serial bus. In the master device only a
write to this register will initiate transmission/re-
ception of another byte.
Notes: During the last clock cycle the SPIF bit is
set, a copy of the received data byte in the shift
register is movedtoabuffer. When theuser reads
the serial peripheral data I/O register, the buffer is
actually being read.
Warning: A write to the DR register places data di-
rectly into the shift register for transmission.
A read to the DR register returns the value located
in the buffer and not the contents of the shift regis-
ter (see Figure 35).
70
SPIF
WCOL
-
MODF
----
70
D7
D6
D5
D4
D3
D2
D1
D0
67
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