ht82k74e Holtek Semiconductor Inc., ht82k74e Datasheet - Page 32

• Manufacturer Part Number: ht82k74e
• Description: 27mhz Keyboard/ Mouse Tx 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Where X is 3pf capacitor.
Rev. 1.00
Bit No.
Bit No.
4~7
0
1
2
3
0
1
2
3
4
5
6
7
PFC0
PFC1
PFC2
PFC3
PFC4~7
Name
MCU
OSC1_C0
OSC1_C1
OSC1_C2
Reserved bit
OSC2_C0
OSC2_C1
OSC2_C2
OSC2_C3
MCU Name
AMP_ctrl
DC_ctrl
LVDF
LVD18
Reserved bit
Function
Name
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
OSC CAP Control Register - OSCC
0: no 2X pf capacitor connected to OSC1 (default)
1: has 2X pf capacitor connected to OSC1
0: no 4X pf capacitor connected to OSC1 (default)
1: has 4X pf capacitor connected to OSC1
0: no 8X pf capacitor connected to OSC1 (default)
1: has 8X pf capacitor connected to OSC1
Always read 0
0: no 2X pf capacitor connected to OSC2 (default)
1: has 2X pf capacitor connected to OSC2
0: no 4X pf capacitor connected to OSC2 (default)
1: has 4X pf capacitor connected to OSC2
0: no 8X pf capacitor connected to OSC2 (default)
1: has 8X pf capacitor connected to OSC2
0: no 16X pf capacitor connected to OSC2 (default)
1: has 16X pf capacitor connected to OSC2
R/W
R/W
R/W
R/W
R
R
Control Register - CTLR
Control AMP function
1: on AMP function
0: off AMP function (default)
This bit is used to decide whether the DC/DC circuit is in operation
0: enable the DC/DC circuit
0: disable the DC/DC circuit
Flag for 2.2V/2.0V battery low signal coming from DC/DC block (the
battery low level 2.2V or 2.0V is selected by configuration option).
1: battery voltage
0: battery voltage > 2.2V/2.0V
1.8V Battery Low signal for DC/DC 1.8V
Always Off in Power Down Mode.
1: battery voltage
0: battery voltage > 1.8V
Always read 0
32
Description for mouse mode
Description for Mouse Mode
2.2V/2.0V
1.8V
HT82K74E/HT82K74EE
December 15, 2009