EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 235

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
SPI Control Register
This register is used to control and setup the serial peripheral interface. The SPI
should be disabled prior to making any changes to CPHA or CPOL. See Table
114.
Table 114. SPI Control Register
(SPI_CTL = 00BAh)
Bit
Reset
CPU Access
Note: R = Read Only; R/W = Read/Write.
Bit
Position
7
IRQ_EN
6
5
SPI_EN
4
MASTER_EN
3
CPOL
2
CPHA
[1:0]
Value Description
0
1
0
0
1
0
1
0
1
0
1
00
R/W
SPI system interrupt is disabled.
SPI system interrupt is enabled.
Reserved.
SPI is disabled.
SPI is enabled.
When enabled, the SPI operates as a slave.
When enabled, the SPI operates as a master.
Master SCK pin idles in a Low (0) state.
Master SCK pin idles in a High (1) state.
SS must go High after transfer of every byte of data.
SS can remain Low to transfer any number of data bytes.
Reserved.
P R E L I M I N A R Y
7
0
R
6
0
R/W
5
0
R/W
4
0
R/W
3
0
Product Specification
Serial Peripheral Interface
R/W
2
1
eZ80F91 MCU
R
1
0
R
0
0
216