HT82B40R datasheet(31/57 Pages) HOLTEK

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HT82B40R/HT82B40A

Rev. 1.10

September 4, 2009

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 a system clock selection bit,

SYSCLK. The PS2 mode indicate bit, PS2_flag, and a system clock adjust control bit, CLK_adj.

Bit No.

Label

R/W

Function

0, 1, 2

¾¾

Reserved bit set

²0²

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)

SUSP2

When set to 1, turn-off Band-gap circuit. Default value is 0.

In the Power-down Mode this bit should be set high to reduce power consumption.The

LVR has no function. In the USB mode this bit cannot be set high.

PS2_flag

R/W

This flag is used to indicate that the

MCUis in the PS2 mode. (Bit=1)

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

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

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).

CLK_adj

R/W

This bit is used to adjust the system clock for the USB mode for temperature changes.

In the Power-down Mode this bit should be set high to reduce power consumption.

0: enable (default)

1: disable

SCC (22H) Register

STALL and PIPE, PIPE_CTRL, Endpt_EN Registers

The PIPE register represents whether the corresponding endpoint is accessed by the host or not. After an ACT_EN sig-

nal has been sent out, the MCU can check which endpoint had been accessed. This register is set only after the a time

when the host is accessing the corresponding endpoint.

The STALL register shows whether the corresponding endpoint works or not. As soon as the endpoint works improp-

erly, the corresponding bit must be set.

The PIPE_CTRL Register is used for configuring the IN (Bit=1) or OUT (Bit=0) Pipe. The default is define IN pipe. Bit0

(DATA0) of the PIPE_CTRL Register is used to set the data toggle of any endpoint (except endpoint 0) using data tog-

gles to the value DATA0. Once the user wants any endpoint (except endpoint 0) using data toggles to the value DATA0.

the user can output a LOW pulse to this bit. The LOW pulse period must at least 10 instruction cycles.

The Endpt_EN Register is used to enable or disable the corresponding endpoint (except endpoint 0) Enable Endpoint

(Bit=1) or disable Endpoint (Bit=0)

The bitmaps are list are shown in the following table:

Name

R/W

Address

Bit7~Bit3

Reserved

Bit 2

Bit 1

Bit 0

Default

Value

PIPE_CTRL

R/W

01000001B

Pipe 2

Pipe 1

DATA0

00000111

STALL

R/W

01000011B

Pipe 2

Pipe 1

Pipe 0

00000111

PIPE

01000100B

Pipe 2

Pipe 1

Pipe 0

00000000

Endpt_EN

R/W

01000111B

Pipe 2

Pipe 1

Pipe 0

00000111

PIPE_CTRL (41H), STALL (43H), PIPE (44H) and Endpt_EN (47H) Registers

The USB_STAT Register (40H) is used to indicate the present USB signal state.

Bit No.

Function

Read/Write

EOP

R/W

01000000B

J_state

R/W

K_state

R/W

SE0

R/W

SE1

R/W

5~7

¾¾

USB_STAT (40H) Register Table

HT82B40R Datasheet(PDF) 31 Page - Holtek Semiconductor Inc

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