HT66F40 datasheet(86/250 Pages) HOLTEK

86 / 250 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

June 4, 2010

¨ HT66F50/HT66F60

Bit

76543210

Name

¾¾

T3CP1

T3CP0

¾¾

T2CP1

T2CP0

R/W

¾¾

R/W

¾¾

R/W

POR

¾¾

Bit 7~6

Unimplemented, read as

²0²

Bit 5

T3CP1: TP3_1 pin Control

0: disable

1: enable

Bit 4

T3CP0: TP3_0 pin Control

0: disable

1: enable

Bit 3~2

Unimplemented, read as

²0²

Bit 1

T2CP1: TP2_1 pin Control

0: disable

1: enable

Bit 0

T2CP0: TP2_0 pin Control

0: disable

1: enable

Programming Considerations

The TM Counter Registers and the Capture/Compare CCRA and CCRB registers, being either 10-bit or 16-bit, all have

a low and high byte structure. The high bytes can be directly accessed, but as the low bytes can only be accessed via

an internal 8-bit buffer, reading or writing to these register pairs must be carried out in a specific way. The important

point to note is that data transfer to and from the 8-bit buffer and its related low byte only takes place when a write or

read operation to its corresponding high byte is executed.

The following steps show the read and write procedures:

· Writing Data to CCRB or CCRA

¨ Step 1. Write data to Low Byte TMxAL or TMxBL

- note that here data is only written to the 8-bit buffer.

¨ Step 2. Write data to High Byte TMxAH or TMxBH

- here data is written directly to the high byte registers and simultaneously data is latched from the 8-bit buffer

to the Low Byte registers.

· Reading Data from the Counter Registers and CCRB or CCRA

¨ Step 1. Read data from the High Byte TMxDH, TMxAH or TMxBH

- here data is read directly from the High Byte registers and simultaneously data is latched from the Low Byte

¨ Step 2. Read data from the Low Byte TMxDL, TMxAL or TMxBL

- this step reads data from the 8-bit buffer.

Data

Bus

8-bit

Buffer

TMxDH

TMxDL

TMxBH

TMxBL

TMxAH

TMxAL

TM Counter Register (Read only)

TM CCRA Register (Read/Write)

TM CCRB Register (Read/Write)

HT66F40 Datasheet(PDF) 86 Page - Holtek Semiconductor Inc

HT66F40 Datasheet(HTML) 86 Page - Holtek Semiconductor Inc

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