Z51F3220FNX Datasheet, PDF (175/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
11.10 SPI 2
11.10.1 Overview
There is serial peripheral interface (SPI 2) one channel in Z51F3220. The SPI 2 allows synchronous serial data
transfer between the external serial devices. It can do Full-duplex communication by 4-wire (MOSI2, MISO2,
SCK2, SS2), support master/slave mode, can select serial clock (SCK2) polarity, phase and whether LSB first
data transfer or MSB first data transfer.
11.10.2 Block Diagram
P ^fx/2
r fx/4
e _fx/8
s
M
fx
c ^fx/16
U
a fx/32
X
l _fx/64
e
r ^fx/128
M
U
X
Edge
Detector
CPOL CPHA
MS
3
SPICR[2 :0]
MS
SC K 2
SCK
Control
MISO2
FXCH
MOSI2
SS 2
SS
Control
M
U
X
8-bit Shift
Register
8
MS
FLSB
D
E
P
SPIDR
(8-bit)
SPIEN
SPI
Control Circuit
WCOL
SPIIFR
Clear
INT_ ACK
To interrupt
block
SSENA MS
Internal Bus Line
Figure 11.49 SPI 2 Block Diagram
PS029902-0212
PRELIMINARY
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