ST7FLITE09Y0B6 FARNELL, ST7FLITE09Y0B6 Datasheet - Page 61

• Manufacturer Part Number: ST7FLITE09Y0B6
• Description: IC, 8BIT MCU, ST7, 16MHZ, DIP-16
• Manufacturer: FARNELL

Specifications of ST7FLITE09Y0B6

• Controller Family/series: ST7
• No. Of I/o's: 13
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 128Byte
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Core Size: 8 Bit
• Program Memory Size: 1.5 Kb
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SERIAL PERIPHERAL INTERFACE (Cont’d)
11.3.3.2 Slave Select Management
As an alternative to using the SS pin to control the
Slave Select signal, the application can choose to
manage the Slave Select signal by software. This
is configured by the SSM bit in the SPICSR regis-
ter (see
In software management, the external SS pin is
free for other application uses and the internal SS
signal level is driven by writing to the SSI bit in the
SPICSR register.
In Master mode:
Figure 39. Generic SS Timing Diagram
Figure 40. Hardware/Software Slave Select Management
– SS internal must be held high continuously
MOSI/MISO
(if CPHA=0)
(if CPHA=1)
Figure
Master SS
Slave SS
Slave SS
40)
SS external pin
SSI bit
Byte 1
SSM bit
1
0
In Slave Mode:
There are two cases depending on the data/clock
timing relationship (see
If CPHA=1 (data latched on 2nd clock edge):
If CPHA=0 (data latched on 1st clock edge):
SS internal
Byte 2
– SS internal must be held low during the entire
– SS internal must be held low during byte
transmission. This implies that in single slave
applications the SS pin either can be tied to
V
ing the SS function by software (SSM= 1 and
SSI=0 in the in the SPICSR register)
transmission and pulled high between each
byte to allow the slave to write to the shift reg-
ister. If SS is not pulled high, a Write Collision
error will occur when the slave writes to the
shift register (see
SS
, or made free for standard I/O by manag-
ST7LITE0xY0, ST7LITESxY0
Byte 3
Section
Figure
11.3.5.3).
39):
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