Rainbow Electronics AT89C5122 - Manual (Page 94)

94
AT8xC5122/23
4202E–SCR–06/06
DC/DC Converter register
Reset Value = 0000 0000b
Table 61. DC/DC Converter Control Register - DCCKPS (S:BFh)
7 6 5 4 3 2 1 0
MODE OVFADJ BOOST1 BOOST0 DCCKPS3 DCCKPS2 DCCKPS1 DCCKPS0
Bit Number Bit Mnemonic Description
7 MODE
Regulation mode
0 : Pump mode (External Inductance required)
1 : Regulator mode (No External inductance required if VCC > CVCC+0.3V)
6 OVFADJ
Current Overflow Adjustment on Smart Card terminal
0 : normal: 100 mA average
1 : normal + 20%
5 - 4 BOOST[1:0]
VCARDOK=0 VCARDOK=1
Maximum Startup Current drawn from power supply
00 : Normal: 30 mA average
01 : Normal + 30%
10 : Normal + 50%
11 : Normal + 80%
Current Overflow Level on Smart Card terminal
00 : Normal = OVFADJ
01 : Normal + 30%
10 : Normal + 50%
11 : Normal + 80%
3 - 0 DCCKPS[3:0]
DC/DC Clock Prescaler Value
0000 : Division factor: 2 (reset value)
0001 : Division factor: 3
0010 : Division factor: 4
0011 : Division factor: 5
0100 : Division factor: 6
0101 : Division factor: 8
0110 : Division factor: 10
0111 : Division factor: 12
1000 : Division factor: 24
Other values are reserved