HT1621B Просмотр технического описания (PDF) - Holtek Semiconductor

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HT1621B

RAM Mapping 32 x 4 LCD Controller for I/O MCU

Holtek Semiconductor 

HT1621

Name

ID

Command Code

D/C

Function

Def.

RC 256K

EXT 256K

1 0 0 0001-10XX-X

1 0 0 0001-11XX-X

C System clock source, on-chip RC oscillator Yes

C System clock source, external clock source

BIAS 1/2

1 0 0 0010-abX0-X

LCD 1/2 bias option

C

ab=00: 2 commons option

ab=01: 3 commons option

ab=10: 4 commons option

BIAS 1/3

TONE 4K

1 0 0 0010-abX1-X

1 0 0 010X-XXXX-X

LCD 1/3 bias option

C

ab=00: 2 commons option

ab=01: 3 commons option

ab=10: 4 commons option

C Tone frequency, 4kHz

TONE 2K

1 0 0 011X-XXXX-X

C Tone frequency, 2kHz

IRQ DIS

1 0 0 100X-0XXX-X

C Disable IRQ output

Yes

IRQ EN

1 0 0 100X-1XXX-X

C Enable IRQ output

F1

1 0 0 101X-X000-X

C

Time base/WDT clock output:1Hz

The WDT time-out flag after: 4s

F2

1 0 0 101X-X001-X

C

Time base/WDT clock output:2Hz

The WDT time-out flag after: 2s

F4

1 0 0 101X-X010-X

C

Time base/WDT clock output:4Hz

The WDT time-out flag after: 1s

F8

1 0 0 101X-X011-X

C

Time base/WDT clock output:8Hz

The WDT time-out flag after: 1/2s

F16

1 0 0 101X-X100-X

C

Time base/WDT clock output:16Hz

The WDT time-out flag after: 1/4s

F32

1 0 0 101X-X101-X

C

Time base/WDT clock output:32Hz

The WDT time-out flag after: 1/8s

F64

1 0 0 101X-X110-X

C

Time base/WDT clock output:64Hz

The WDT time-out flag after: 1/16s

F128

1 0 0 101X-X111-X

C

Time base/WDT clock output:128Hz

The WDT time-out flag after: 1/32s

Yes

TEST

NORMAL

1 0 0 1110-0000-X

1 0 0 1110-0011-X

C Test mode, user don¢t use.

C Normal mode

Yes

Note:

X : Don,t care

A5~A0 : RAM addresses

D3~D0 : RAM data

D/C : Data/command mode

Def. : Power on reset default

All the bold forms, namely 1 1 0, 1 0 1, and 1 0 0, are mode commands. Of these, 1 0 0 indicates the command

mode ID. If successive commands have been issued, the command mode ID except for the first command will

be omitted. The source of the tone frequency and of the time base/WDT clock frequency can be derived from

an on-chip 256kHz RC oscillator, a 32.768kHz crystal oscillator, or an external 256kHz clock. Calculation of the

frequency is based on the system frequency sources as stated above. It is recommended that the host control-

ler should initialize the HT1621 after power on reset, for power on reset may fail, which in turn leads to the mal-

functioning of the HT1621.

Rev. 1.30

13

August 6, 2003

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