HT95C20P datasheet(21/50 Pages) HOLTEK

21 / 50 page

HT95C200/20P/300/30P

Rev. 0.10

October 1, 2002

Preliminary

For the HT95C200/20P, the PD0~PD7 and

COM0~COM7 share the same pads. They can only be

selected per byte by software option at any time.

When the PD0~PD7 or the PE0~PE3 are not selected,

the I/O port control register (19H), PEC (1BH) could be

read/write-able and be used as a general user RAM, but

this function is not available for register PD (18H) and

PE (1AH).

FSK decoder

The FSK decoder supports three interrupt sources to

the peripheral interrupt vector. There are ring detect or

line reversal detect, FSK carrier detect and FSK packet

data. Write 0 to the control flag, RMSK, CMSK and

FMSK will enable these interrupt. When any of these in-

terrupt occurs, its interrupt flag (RDETF, CDETF, FSKF)

will be set to 1 by hardware even if the interrupt is dis-

abled. These interrupts will cause a peripheral interrupt

if the peripheral interrupt is enabled.When the periph-

eral interrupt occurs, the interrupt request flag PERF will

be set and a subroutine call to location 10H will occur.

Returning from the interrupt subroutine, the interrupt

flag RDETF, CDETF or FSKF will not be cleared by

hardware, the user should clear it by software. If inter-

rupt flag RDETF is not cleared, next ring detect interrupt

will be inhibited, other interrupt flags CDETF, FSKF

have the same behavior. The power down mode

(F_PWDN=1) will terminate all the FSK decoder func-

tion, however, the registers FSKC, FSKS and FSKD are

accessible at this power down mode.

Label

Bits

R/W

Function

LCDIO

(28H)

0~4

Unused bit, read as

²0²

SPE0

For HT95C300/30P only

0: SEG44~SEG47 pins are LCD segment output

1: SEG44~SEG47 pins are PE0~PE3 pins

SPD0

For HT95C300/30P only

0: SEG36~SEG39 pins are LCD segment output

1: SEG36~SEG39 pins are PD0~PD3 pins

SPD1

For HT95C300/30P only

0: SEG40~SEG43 pins are LCD segment output

1: SEG40~SEG43 pins are PD4~PD7 pins

LCDC

(2DH)

VBIAS

For HT95C300/30P

0: COM0~COM7 are LCD common output

1: COM0~COM7 are unused pin

For HT95C200/20P

0: COM0~COM7 are LCD common output

1: COM0~COM7 are PD0~PD7 pins

Label

Bits

R/W

Function

FSKC

(29H)

F_PWDN

FSK decoder power down

1: FSK decoder is at power down mode

0: FSK decoder is at operation mode

1RO

Unused bit, read as

²0²

FMSK

FSK packet data interrupt mask

1: Disable FSK packet data interrupt

0: Enable FSK packet data interrupt

RMSK

Ring or line reversal detect interrupt mask

1: Disable ring or line reversal detect interrupt

0: Enable ring or line reversal detect interrupt

CMSK

Carrier detect interrupt mask

1: Disable carrier detect interrupt

0: Enable carrier detect interrupt

FSKSEL

Select FSK packet data source

1: FSK packet data source is DOUTC

0: FSK packet data source is DOUT

6, 7

Unused bit, read as

²0²

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