Identiv uTrust 4711F - Contact_Get_Set_Clk_Frequency

Document Version 1.2
Last revised on
2017-09-26
Page 80 of 92
Reference Manual for uTrust 4701F and uTrust 4711F Readers
Byte0
Byte1
Byte2
Byte3
Byte4
Byte 5
onwards
Escape
code(0x10)
LSB of send
length
MSB of send
length
LSB of expected
length
MSB of
expected
length
Raw data to
the card
Output:
Output buffer
Response APDU
6.3.5.8. CONTACT_GET_SET_CLK_FREQUENCY
This Escape command is used to instruct the reader to change the clock for the smart card or to get
the current Clock divisor used. Once set, the change in frequency will take effect immediately. Default
divisor value is 10, that is 4.8MHz.
Input:
The first byte of the input buffer contains the Escape code; the next byte contains the clock divisor
value to set the clock frequency or 0xFF to get the clock frequency.
Byte0
Byte1
Value
Description
Escape code(0x1F)
Clock divisor
The value to be Set in the smartcard CLK divisor register
0xFF
Get current Clock divisor value
Output:
Set clock frequency: None
Get clock frequency: One byte value indicating the current Clock divisor.
Output buffer
NULL or current divisor
Clock Divisor values:
DIVISOR VALUE
SCCLK Frequency
0x04
4 MHz
0x03
4.8 MHz
0x02
6 MHz
0x01
8 MHz
0x00
12 MHz
DataIn = 1F FF
DataOut: 03 (1 byte)