HT66F03 datasheet(49/139 Pages) HOLTEK

49 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

I/O Port Control Register

The I/O port has its own control register known as PAC, to control the input/output configuration. With this control regis-

ter, each CMOS output or input can be reconfigured dynamically under software control. Each pin of the I/O port is di-

rectly mapped to a bit in its associated port control register. For the I/O pin to function as an input, the corresponding bit

of the control register must be written as a

²1². This will then allow the logic state of the input pin to be directly read by in-

structions. When the corresponding bit of the control register is written as a

²0², the I/O pin will be setup as a CMOS out-

put. If the pin is currently setup as an output, instructions can still be used to read the output register. However, it should

be noted that the program will in fact only read the status of the output data latch and not the actual logic status of the

output pin.

· PAC Register

Bit

76543210

Name

R/W

POR

11111111

Bit 7~0

I/O Port bit 7 ~ bit 0 Input/Output Control

0: Output

1: Input

Pin-remapping Functions

The flexibility of the microcontroller range is greatly enhanced by the use of pins that have more than one function.

Limited numbers of pins can force serious design constraints on designers but by supplying pins with multi-functions,

many of these difficulties can be overcome. The way in which the pin function of each pin is selected is different for each

function and a priority order is established where more than one pin function is selected simultaneously. Additionally

there is a PRM register to establish certain pin functions. Generally speaking, the analog function has higher priority

than the digital function. However, if more than two analog functions are enabled and the analog signal input comes

from the same external pin, the analog input will be internally connected to all of these active analog functional mod-

ules.

Pin-remapping Registers

The limited number of supplied pins in a package can impose restrictions on the amount of functions a certain device

can contain. However by allowing the same pins to share several different functions and providing a means of function

selection, a wide range of different functions can be incorporated into even relatively small package sizes.

· Pin-remapping Register List

Name

Bit

76543210

PRM

PRML3

PRML2

PRML1

PRML0

PRMS2

PRMS1

PRMS0

HT66F03 датащи(PDF) 49 Page - Holtek Semiconductor Inc

HT66F03 датащи(HTML) 49 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL