Z51F3220FNX Datasheet, PDF (238/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
11.13.13 USI1 SPI Block Diagram
SS 1
SS
Control
USI1 SSEN
MASTER1
SCLK
(fx: System clock)
USI1BD
Baud Rate Generator
SCK1
MISO1
FXCH1
SCK
Control
M
U
X
RXE1
M
U
Rx Control
X
RXC1
M
Edge Detector
U
And
X
Controller
I
N
T
CPOL1 CPHA1
E
Data
Receive Shift Register
R
Recovery
(RXSR)
N
A
L
RXCIE1
LOOPS 1
DOR1 Checker
USI1 DR[0], (Rx)
B
U
USI1 DR[1], (Rx)
S
MOSI1
MASTER1
To interrupt
block
ORD1
L
I
( MSB/LSB -1st)
N
TXE1
E
D
E
Tx Control
P
Clear
INT_ ACK
TXC1
Empty signal
DRE1
Transmit Shift Register
(TXSR)
USI1DR, (Tx)
TXCIE1
DRIE1
To interrupt
block
Figure 11.87 USI1 SPI Block Diagram
PS029902-0212
PRELIMINARY
236