HT1621
Command Summary
Name
READ
ID
Command Code
D/C
D
Function
Read data from the RAM
Write data to the RAM
Def.
1 1 0 A5A4A3A2A1A0D0D1D2D3
1 0 1 A5A4A3A2A1A0D0D1D2D3
WRITE
D
READ-
MODIFY-
WRITE
1 0 1 A5A4A3A2A1A0D0D1D2D3
1 0 0 0000-0000-X
D
C
READ and WRITE to the RAM
Turn off both system oscillator
and LCD bias generator
SYS DIS
Yes
Yes
SYS EN
LCD OFF
LCD ON
1 0 0 0000-0001-X
1 0 0 0000-0010-X
1 0 0 0000-0011-X
C
C
C
C
Turn on system oscillator
Turn off LCD bias generator
Turn on LCD bias generator
Disable time base output
TIMER DIS 1 0 0 0000-0100-X
WDT DIS
1 0 0 0000-0101-X
TIMER EN 1 0 0 0000-0110-X
WDT EN
1 0 0 0000-0111-X
Disable WDT time-out flag
output
C
C
C
Enable time base output
Enable WDT time-out flag
output
TONE OFF 1 0 0 0000-1000-X
TONE ON
1 0 0 0000-1001-X
C
C
Turn off tone outputs
Turn on tone outputs
Yes
Clear the contents of time base
generator
CLR TIMER 1 0 0 0000-11XX-X
C
C
C
CLR WDT
XTAL 32K
1 0 0 0000-111X-X
1 0 0 0001-01XX-X
Clear the contents of WDT stage
System clock source, crystal
oscillator
System clock source, on-chip RC
oscillator
RC 256K
1 0 0 0001-10XX-X
1 0 0 0001-11XX-X
C
C
Yes
System clock source, external
clock source
EXT 256K
LCD 1/2 bias option
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
BIAS 1/2
BIAS 1/3
1 0 0 0010-abX0-X
1 0 0 0010-abX1-X
C
C
LCD 1/3 bias option
ab=00: 2 commons option
ab=01: 3 commons option
ab=10: 4 commons option
TONE 4K
TONE 2K
IRQ DIS
1 0 0 010X-XXXX-X
1 0 0 011X-XXXX-X
1 0 0 100X-0XXX-X
C
C
C
Tone frequency, 4kHz
Tone frequency, 2kHz
Disable IRQ output
Yes
18
January 10, 2001
ETC [ ETC ]
