HT9480 datasheet(28/47 Pages) HOLTEK

28 / 47 page

HT9480

Rev. 1.20

July 31, 2002

Baud rate selection bits (SPF12, SPF13, SPF14)

SPF12

SPF13

SPF14

Connected Crystal (Hz)

Baud Rate (Hz)

32768

512

76.8k

512

76.8k

1200

76.8k

2400

153.6k

512

153.6k

1200

153.6k

2400

· SPF15

1: 4-bit burst error correction for address and

message code-word

0: 2-bit random error correction for address

and message code-word

· SPF16

1: Out-of-range Hold-off period according to

SPF06 and SPF07

0: Out-of-range Hold-off period is zero

regardless of SPF06 and SPF07

· SPF17

Tone generation frequency source selector

0: System clock

1: 32.768kHz

· SPF18

Tone generation frequency duty control

0: frequency duty cycle 1/2

1: frequency duty cycle 1/4

· SPF19

Non-inversion or inversion data input selection

1: Inversion input selected for DI from RF

Circuit, referring to DI

0: Non-inversion input selected for DI from

RF circuit

· SPF20

Message code-word packaging method

1: 4 bits packaging mode

0: 7 bits ASCII mode

· SPF21, SPF22, SPF23

Internal state status (for testing only)

Mask option

The following table illustrates nine kinds of mask options

in the HT9480. All of the options should be defined to

ensure proper system functioning.

No.

Mask Option

HALT function selection. This option defines the way of enabling or disabling the HALT function.

WDT source selection. This option selects the WDT source, from either the subsystem clock, or instruction

clock, or disabling the WDT function.

CLRWDT times selection. This option defines the way of clearing the WDT by instruction.

²Once² means

that the

²CLR WDT² can clear the WDT and ²Twice² implies that the ²CLR WDT1² and ²CLR WDT2² should

be executed before the time-out so as to clear the WDT.

Wake-up selection. This option defines the wake-up activity. Port A has the capability of waking-up the chip

from HALT.

PB, PC0, and PC1 pull-high options

MCU OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as the system

clock.

WDT prescaler selection. The prescaler can be set to 1/1024 or 1/2048

FOUT connection selection. The FOUT output can be connected to the OSC1 input or not.

Double frequency selection. The FOUT can be doubled from the X1 input clock.

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