Microchip Technology MRF24WN0MA, Руководство пользователя

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MRF24WN0MA/MB
DS50002410A-page 12
Advance Information

2015 Microchip Technology Inc.
2.3 SPI Port Pins
The MRF24WN0MA/MB module interfaces to the
PIC32 MCU via a 4-wire SPI port. Refer to
Figure 2-2
and Table 2-2 for the necessary signaling conditions.
In the case of the SPI_CS/MODE1 pin, pull-up using a
10 k

resistor and the host MCU allows an active-high
signal during power on and wake-up to ensure that the
module start-up in normal operation. Once the module
is operational, the pin becomes the SPI Port Chip
Select pin (active-low).
FIGURE 2-2: SPI SLAVE INTERFACE TIMING
TABLE 2-2: SPI SLAVE TIMING CONSTRAINTS
Parameter Description Min. Max. Unit
f
PP
Clock Frequency 0 48 MHz
t
WL
Clock Low Time 8.3 — ns
t
WH
Clock High Time 8.3 — ns
t
TLH
Clock Rise Time — 2 ns
t
THL
Clock Fall Time — 2 ns
t
ISU
Input Setup Time 5 — ns
t
IH
Input Hold Time 5 — ns
t
O
_
DLY
Output Delay 0 5 ns
Clock
MOSI
MISO
V
IH
V
IL
V
IH
V
IL
V
OH
V
OL
f
PP
t
WL
t
WH
t
TLH
t
THL
t
ISU
t
IH
t
O_DLY(max)
t
O_DLY(min)