at75c220 ATMEL Corporation, at75c220 Datasheet - Page 128

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

Table 27. SPI Memory Map (Continued)
SPI Control Register
Register Name:SP_CR
Access Type:Write-only
•
•
•
128
SPIEN: SPI Enable
SPIDIS: SPI Disable
SWRST: SPI Software reset
Offset
0 = No effect.
1 = Enables the SPI to transfer and receive data.
0 = No effect.
1 = Disables the SPI.
All pins are set in input mode and no data is received or transmitted.
If a transfer is in progress, the transfer is finished before the SPI is disabled.
If both SPIEN and SPIDIS are equal to one when the control register is written, the SPI is disabled.
0 = No effect.
1 = Resets the SPI.
A software-triggered hardware reset of the SPI interface is performed.
0x2C
0x3C
SWRST
0x20
0x24
0x28
0x30
0x34
0x38
31
23
15
–
–
–
7
Register Name
SP_CSR0
SP_RPR
SP_RCR
SP_TCR
SP_TPR
30
22
14
–
–
–
6
–
–
–
–
AT75C220
Register
Receive Pointer Register
Receive Counter Register
Transmit Pointer Register
Transmit Counter Register
Chip Select Register 0
Reserved
Reserved
Reserved
29
21
13
–
–
–
5
–
28
20
12
–
–
–
4
–
27
19
11
–
–
–
3
–
26
18
10
Read/write
Read/write
Read/write
Read/write
Read/write
–
–
–
2
–
Access
–
–
–
SPIDIS
25
17
–
–
9
–
1
Reset Value
0
0
0
0
0
–
–
–
SPIEN
24
16
–
–
8
–
0