ht82m9be Holtek Semiconductor Inc., ht82m9be Datasheet - Page 23

• Manufacturer Part Number: ht82m9be
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Clock Control Register - SCC
There is a system clock control register implemented to select the clock used in the MCU. This register consists of USB
clock control bit (USBCKEN), second suspend mode control bit (SUSPEND2) and system clock selection (SCLKSEL).
Table High Byte Pointer for Current Table Read - TBHP
Options
Rev. 1.60
Bit No.
Bit No.
0~2
4~0
No.
10
11
3
4
5
6
7
1
2
3
4
5
6
7
8
9
PGC4~PGC0
WDT clock source: RC (system/4) (default: T1)
WDT clock source: enable/disable for normal mode (default: disable)
PA0~PA7 ,PB4, PB7 wake-up by bit (PA2, PA3 both wake-up by falling or rising edge)
(default: non wake-up)
PA0~PA7 pull-high by bit (default: pull-high)
PB pull-high by bit (default: pull-high)
PC pull-high by nibble (default: pull-high)
LVR enable/disable (default: enable)
PA0~PA3, PB2, PB3 pull-low by bit (default: non pull-low 30k )
TBHP enable/disable (default: disable)
PA output mode (CMOS/NMOS/PMOS) by bit (default: CMOS)
CLR WDT , 1 or 2 instructions
PF0~PF2
Label
Label
PF3
PF4
PF5
PF6
PF7
Read/Write
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SUSPEND2
USBCKEN
SCLKSEL
PS2_flag
Option
Option
TBHP (0X1F) Register
SCC (0X1C) Register
Reserved, must set to 0 .
USB clock control bit. When set to 1 , indicates a USBCK ON,
else USBCK OFF. The default value is 0 .
This bit is used to reduce power consumption in the suspend
mode. In the normal mode this bit must be cleared to zero(De-
fault= 0 ). In the HALT mode this bit should be set high to re-
duce power consumption and LVR with no function. In the USB
mode this bit cannot be set high.
Reserved, must set to 0 .
System clock 6MHz or 12MHz option, when working on exter-
nal oscillator mode. The default value is 0 .
0: Operating at external 12MHz mode
1: Operating at external 6MHz mode
The default value is 0 .
This flag is used to show that the MCU is in PS2 mode (Bit=1).
This bit is R/W by FW and will be cleared to zero after power-on
reset. The default value is 0 .
Store current table read bit12~bit8 data
23
Option
Functions
Functions
HT82M9BE/HT82M9BA
April 16, 2008