ST72E121 Datasheet, PDF (63/92 Pages) STMicroelectronics – 8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

ST72E121 ST72T121
SERIAL PERIPHERAL INTERFACE (Cont’d)
Figure 36. Serial Peripheral Interface Block Diagram
MOSI
MISO
SCK
SS
Internal Bus
Read
DR
Read Buffer
8-Bit Shift Register
Write
MASTER
CONTROL
IT
request
SR
SPIF WCOL _- MODF _-
-
-
-
SPI
STATE
CONTROL
CR
SPIE SPE SPR2 MSTR CPOL CPHA SPR1 SPR0
SERIAL
CLOCK
GENERATOR
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