HT66F40 datasheet(89/244 Pages) HOLTEK

89 / 244 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.60

October 24, 2011

¨ HT68F50/HT68F60

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.

As the CCRA and CCRB registers are implemented in the way shown in the following diagram and accessing these

cess the CCRA and CCRB low byte registers, named TMxAL and TMxBL, using the following access procedures. Ac-

cessing the CCRA or CCRB low byte registers without following these access procedures will result in unpredictable

values.

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.

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)

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