EM2420 ETC [List of Unclassifed Manufacturers], EM2420 Datasheet - Page 26

• Manufacturer Part Number: EM2420
• Description: 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

Figure 8. SPI timing diagram
Table 4. SPI timing specification
Status byte
During transfer of the register access byte,
command strobes, the first RAM address
byte and data transfer to the TXFIFO, the
EM2420 status byte is returned on the SO
Ember Part Number: 120-0049-000C
Parameter
SCLK, clock
frequency
SCLK low
pulse
duration
SCLK high
pulse
duration
CSn setup
time
CSn hold time
SI setup time
SI hold time
Rise time
Fall time
Note: The set-up- and hold-times refer to 50% of VDD.
SCLK
CSn
SO
SO
SO
SO
SO
SI
SI
SI
SI
SI
Write to register / RXFIFO:
Write to TXFIFO:
Read from register / RXFIFO:
Read and write one byte to RAM: (multiple read / writes also possible)
Read one byte from RAM: (multiple reads also possible)
t
sp
S7
S7
S7
S7
S7
0
0
0
1
1
S6
S6
S6
A6
S6
A6
S6
0
0
1
A5
S5
A5
S5
A5
S5
A5
S5
A5
S5
t
Symbol
F
t
t
t
t
t
t
t
t
ch
cl
ch
sp
ns
sd
hd
rise
fall
SCLK
A4
S4
A4
S4
A4
S4
A4
S4
A4
S4
A3
S3
A3
S3
A3
S3
A3
S3
A3
S3
A2
S2
A2
S2
A2
S2
A2
S2
A2
S2
t
Min
25
25
25
25
25
25
cl
A1
S1
A1
S1
A1
S1
A1
S1
A1
S1
A0
S0
A0
S0
A0
S0
A0
S0
A0
S0
X
X
X
X
D
Max
10
100
100
t
S7
R
D
sd
D
15
W
B1
B1
W
15 D
7
D
D
S6
B0
B0
W
R
W
EM2420 Datasheet
14 D
14 D
6
D
S5
W
R
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
0
1
W
13 D
13 D
5
D
S4
W
R
X
X
W
12 D
12 D
X
X
4
D
S3
W
R
X
X
W
11 D
11 D
3
pin. The status byte contains 6 status bits
which are described in Table 5.
Issuing a SNOP (no operation) command
strobe may be used to read the status
byte. It may also be read during access to
D
W
S2
Conditions
The minimum time SCLK must be low.
The minimum time SCLK must be high.
The minimum time CSn must be low before the first
positive edge of SCLK.
The minimum time CSn must be held low after the
last negative edge of SCLK.
The minimum time data on SI must be ready
before the positive edge of SCLK.
The minimum time data must be held at SI, after
the positive edge of SCLK.
The maximum rise time for SCLK and CSn
The maximum fall time for SCLK and CSn
R
X
X
W
10
10 D
2
D
D
S1
W
W
X
X
R
9
9
1
D
D
D
S0
X
X
W
W
R
t
hd
8
0
8
X
X
X
X
D
D
D
X
S7
D
D
R
D
R
R
7
7
7
W
W
W
7
7
7
D
D
D
D
D
D
W
W
S6
R
W
R
R
6
6
6
6
6
6
D
D
D
D
D
D
W
W
S5
R
W
R
R
5
5
5
5
5
5
D
D
D
D
D
D
W
W
S4
R
W
R
R
4
4
4
4
4
4
EM2420
D
D
D
D
D
D
X
W
W
S3
W
R
R
R
3
3
3
3
3
3
D
D
D
D
D
D
W
W
S2
W
R
R
R
2
2
2
2
2
2
D
D
D
D
D
D
W
W
W
Page 26 of 89
S1
R
R
R
1
1
1
1
1
1
D
D
D
D
D
D
W
W
S0
R
W
R
R
0
0
0
0
0
0
D
t
D
D
R
ns
R
R
15
7
7
X
X
X
S7