ht82m99e Holtek Semiconductor Inc., ht82m99e Datasheet - Page 23

• Manufacturer Part Number: ht82m99e
• Description: Ht82m99e/ht82m99a -- Usb Mouse Encoder 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Clock Control Register SCC (Address 0X1C)
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 (Address 0X1F)
OTP Options
The LVR voltage is define as 2.7V 0.3V and default is enable.
Rev. 2.20
Register
Register Bits
(0X1C)
(0X1F)
TBHP
SCC
No.
10
1
2
3
4
5
6
7
8
9
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 nibble (default: Pull-high)
2.7 V (error 0.3V) 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)
2~0
CLR WDT , 1 or 2 instructions
Bits
2~0
3
4
5
6
7
PGC2~PG0
PF2~PF0
Labels
Labels
PF3
PF4
PF5
PF6
PF7
Read/Write
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R
SUSPEND2
USBCKEN
SCLKSEL
PS2_flag
Option
Option
23
Option
Reserved
USB clock control bit. When set to 1 , indicates a
USBCK ON, else USBCK OFF. Default value is 0 .
This bit is used to reduce power consumption in the sus-
pend mode. In the normal mode this bit must be cleared
to zero(Default= 0 ). In the HALT mode this bit should
be set high to reduce power consumption and LVR with
no function. In the USB mode this bit cannot be set high.
Reserved
System clock 6MHz or 12MHz option, when working on
external oscillator mode. Default value is 0 .
0: Operating at external 12MHz mode
1: Operating at external 6MHz mode
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 is 0 .
Store current table read bit10~bit8 data
HT82M99E/HT82M99A
Functions
Functions
April 16, 2008