參數(shù)資料
型號: CY7C63823
廠商: Cypress Semiconductor Corp.
英文描述: enCoRe II Low-Speed USB Peripheral Controller(enCoRe II低速USB外設(shè)控制器)
中文描述: enCoRe II還低速USB外設(shè)控制器(enCoRe II還低速的USB外設(shè)控制器)
文件頁數(shù): 36/74頁
文件大小: 1441K
代理商: CY7C63823
CY7C63310
CY7C638xx
Document 38-08035 Rev. *I
Page 36 of 74
15.0
Serial Peripheral Interface (SPI)
The SPI Master/Slave Interface core logic runs on the SPI clock domain, making its functionality independent of system clock
speed. SPI is a four pin serial interface comprised of a clock, an enable and two data pins.
15.1
SPI Data Register
When an interrupt occurs to indicate to firmware that a byte of receive data is available, or the transmitter holding register is empty,
firmware has 7 SPI clocks to manage the buffers—to empty the receiver buffer, or to refill the transmit holding register. Failure to
meet this timing requirement will result in incorrect data transfer.
Table 14-16. P2 Configuration (P2CR) [0x15] [R/W]
Bit #
7
6
5
4
3
2
1
0
Field
Reserved
Int Enable
Int Act Low
TTL Thresh
High Sink
Open Drain
Pull-up Enable
Output Enable
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
This register only exists in CY7C638xx. This register controls the operation of pins P2.0–P2.1. In the CY7C638xx, only 8 mA
sink drive capability is available on this pin regardless of the setting of the High Sink bit
Table 14-17. P3 Configuration (P3CR) [0x16] [R/W]
Bit #
7
6
5
4
3
2
1
0
Field
Reserved
Int Enable
Int Act Low
TTL Thresh
High Sink
Open Drain
Pull-up Enable
Output Enable
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
1
0
This register exists in CY7C638xx. This register controls the operation of pins P3.0–P3.1.
In the CY7C638xx, only 8 mA sink drive capability is available on this pin regardless of the setting of the High Sink bit
Table 15-1. SPI Data Register (SPIDATA) [0x3C] [R/W]
Bit #
7
6
5
4
3
2
1
0
Field
SPIData[7:0]
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
When read, this register returns the contents of the receive buffer. When written, it loads the transmit holding register
Bit [7:0]:
SPI Data [7:0]
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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