ST72F623F2M1TR STMicroelectronics, ST72F623F2M1TR Datasheet - Page 58

• Manufacturer Part Number: ST72F623F2M1TR
• Description: IC MCU 8BIT 8K FLASH 20-SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F623F2M1TR

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 11
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 3x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-SOIC (7.5mm Width)
• Processor Series: ST72F6x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: SCI, SPI, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 11
• Number Of Timers: 2
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit, 3 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

ST7262xxx
SERIAL PERIPHERAL INTERFACE (Cont’d)
10.4.3.2 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 41. Generic SS Timing Diagram
Figure 42. Hardware/Software Slave Select Management
58/139
– SS internal must be held high continuously
MOSI/MISO
(if CPHA=0)
(if CPHA=1)
Figure
Master SS
Slave SS
Slave SS
42)
SS external pin
SSI bit
Byte 1
SSM bit
1
0
Doc ID 6996 Rev 5
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-
Byte 3
Section
Figure
10.4.5.3).
41):