CHIPDRIVE CLOUD 4700F 905511 数据表
产品代码
905511
CLOUD
47
X
0
F
R
EFERENCE
M
ANUAL
84
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.
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.
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.
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
12
4 MHz
10
4.8 MHz
8
6 MHz
7
6.8 MHz
6
8 MHz
5
9.6 MHz
4
12 MHz
3
16 MHz
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