
AT88RF1354 SPI User Guide For CryptoRF
4.4.3
SL1:
PLL Sleep. A one turns the PLL off in standby mode.
4.4.4
SL0:
Oscillator Sleep. A one turns the crystal oscillator off in standby mode.
4.4.5
ENB:
CLKO Output Enable Bar. A one disables the CLKO output.
4.4.6
RFU:
Reserved for Future Use. All RFU bits must contain 0 b.
4.4.7
RS1/0:
CLKO Rate Select bit. Set the PLL frequency for CLKO pin.
Table 8.
RS1/0 CLKO Rate Select bit Coding
Bit 1
Bit 0
CLKO Frequency
0 0 1.978
MHz
0 1 3.955
MHz
1 0 7.910
MHz
1 1 15.82
MHz
4.4.8
TXP:
Transmit Power. 1 b selects low RF power. 0 b selects high RF power.
4.4.9
ML:
Modulation Level. Adjusts the level of a zero transmitted by the reader. Typical setting is
11% modulation index, 0001000 b.
Table 9.
Transmit Modulation Settings
ML
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Modulation index
0 0 0 0 0 0 1
8%
0 0 0 0 0 1 0
9%
0 0 0 0 1 0 0
10%
0 0 0 1 0 0 0
11%
0 0 1 0 0 0 0
12%
0 1 0 0 0 0 0
13%
1 0 0 0 0 0 0
14%
All other values are NOT supported.
Warning:
Do not set multiple bits in the ML field to 1 b. Improper configuration of this register
can result in permanent damage to the device.
4-5
8586A—RFID—5/09