HT82K95EE/HT82K95AE

Rev. 1.20

25

August 28, 2006

There is a system clock control register implemented to select the clock used in the MCU. This register consists of the

USB clock control bit (USBCKEN), second suspend mode control bit (SUSP2) and system clock selection (SYSCLK).

Bit No.

Label

R/W

Function

2~0, 7

¾¾

Undefined, should be cleared to

²0²

3

USBCKEN R/W

USB clock control bit. When this bit is set to

²1², it indicates that the USB clock is en-

abled. Otherwise, the USB clock is turned-off. (Default=

²0²)

4

SUSP2

R/W

This bit is used for decreasing power consumption in suspend mode.

In normal mode clean this bit=0 (Default=

²0²)

In HALT mode set this bit=1 for decreasing power consumption.

5

PS2_flag

R/W

This flag is used to show the MCU is under PS2 mode. (Bit=1)

This bit is R/W by FW and will be cleared to

²0² after power-on reset. (Default=²0²)

6

SYSCLK

R/W

This bit is used to specify the system oscillator frequency used by the MCU. If a

6MHz crystal oscillator or resonator is used, this bit should be set to

²1². If a 12MHz

crystal oscillator or resonator is used, this bit should be cleared to

²0² (default).

SCC (1CH) Register

Table High Byte Pointer for Current Table Read TBHP (Address 0X1F)

Register

Bits

Labels

Read/Write

Option

Functions

TBHP (0X1F)

3~0

PGC3~PGC0

R/W

¾

Store current table read bit11~bit8 data

Options

The following table shows all kinds of option in the microcontroller. All of the options must be defined to ensure proper

system functioning.

No.

Option

1

Chip lock bit (by bit)

2

PA0~PA7 pull-high resistor enabled or disabled (by bit)

3

PB0~PB7 pull-high resistor enabled or disabled (by nibble)

4

PC0~PC7 pull-high resistor enabled or disabled (by nibble)

5

PD0~PD7 pull-high resistor enabled or disabled (by nibble)

6

LVR enable or disable

7

WDT enable or disable

8

9

²CLRWDT² instruction(s): 1 or 2

10

PA0~PA7 output structures: CMOS/NMOS open-drain/PMOS open-drain (by bit)

11

PA0~PA7 wake-up enabled or disabled (by bit)

12

PB0~PB7 wake-up enabled or disabled (by nibble)

13

PC0~PC7 wake-up enabled or disabled (by nibble)

14

PD0~PD7 wake-up enabled or disabled (by nibble)

15

TBHP enable or disable (default disable)