Rainbow Electronics AT77C104B - Manual (Page 13)

13
AT77C104B
5347B–BIOM–08/04
Modectrl Register Register Name:Modectrl (7 bits)
Access Type:Read/Write
Function:Mode control
• MODE: select operating mode
0000: standby
0001: test (reserved for factory use)
0010: click
0100: navigation
1000: acquisition
Certain changes can be made. For example, MODE can be set to 0b0110 to activate
click and navigation.
• ANALOGRST: reset local oscillator
0: oscillator in active mode
1: oscillator in power-down mode
Notes: 1. Click or navigation modes cannot be used when the local oscillator is switched off. .
2. To return to standby mode and stop the oscillator (to save on power consumption),
two Modectrl register accesses are
necessary: the first one to select standby mode and the second to switch off the
oscillator.
3. The read-only registers cannot be read when the oscillator is turned off.
4. To shift between navigation and acquisition modes, you must be in standby mode
(Modectrl = 0b00001).
If modes such as “acquisition and click” or “acquisition and navigation” are programmed
together, they will be ignored by the system.
With x = 0 or 1.
b6 b5 b4 b3 b2 b1 b0
MODE (MSB) MODE MODE MODE (LSB) ANALOGRST – –
0 0 0 0 1 0 0
Programmed Mode Register Value
11xx 01xx
1x1x 0x1x