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Document Number: 002-xxxxx Rev. ** 
Page 30 of 42
PRELIMINARY
CYBLE-013025-00
CYBLE-013030-00
Timing and AC Characteristics
In this section, use the numbers listed in the Reference column of each table to interpret the following timing diagrams.
UART Timing
Figure 15.  UART Timing
SPI Timing
The SPI interface supports clock speeds up to 12 MHz with VDDIO 
≥ 2.2V. The supported clock speed is 6 MHz when 2.2V > VDDIO 
≥ 1.62V.
 and 
 show the timing requirements when operating in SPI Mode 0 and 2, and SPI Mode 1 and 3, respectively.
Table 21. UART Timing Specifications
Reference
Characteristics
Min
Max
Unit
Delay time, UART_CTS_N low to UART_TXD valid 
– 
24 
Baud out cycles
Setup time, UART_CTS_N high before midpoint of stop bit 
– 
10 
ns
Delay time, midpoint of stop bit to UART_RTS_N high 
– 
2
Baud out cycles
Table 22. SPI Interface Timing Specifications
Reference
Characteristics
Min
Typ
Max
1
Time from CSN asserted to first clock edge
1 SCK
100
?
2
Master setup time
¾ SCK
3
Master hold time
¾ SCK
4
Slave setup time
¾ SCK
5
Slave hold time
¾ SCK
6
Time from last clock edge to CSN deasserted
1 SCK
10 SCK
100