Holtek HT827A0 Manual page 24

Code
1xxx xxxx
0000 0000
0000 0010
0000 0011
0000 0101
0000 0111
0000 1011
0000 1111
0001 0001
0001 0111
0010 0011
0010 1111
0100 0100
0101 1111
0111 0111
Other codes
BEAT frequency table
Note: ²¾² means unknown beats
B e a t f r e q u e n c y
t a b l e P L A
2 k H z
B e a t c o u n t e r
T E N
BEAT counter
The TEMPO register counts melodies. A tempo
frequency is generated after tempo data are
loaded and the TEMPO counter is also enabled.
The tempo determines the beat time period.
When the SRON bit of TEMPO register be clear
as ²0², the ²TMPEN¬0² is automatic occur at
the same time. That is to say, if SRON=0,
TMPEN always equals ²0².
Beat Labels Bits
Beat time-out
TN0~
1/24 Beat TN3
1/8 Beat
1/6 Beat
1/4 Beat TMPEN
1/3 Beat
1/2 Beat
SRON
2/3 Beat
3/4 Beat
1 Beat
3/2 Beat
Code
2 Beats
0000
3 Beats
0001
4 Beats
0010
5 Beats
0011
¾
0100
0101
0110
0111
D A T A B U S
1000
1001
1010
1011
S e t t h e B T O
1100
1101
1110
1111
24
Function
To define the tempo frequency
0~3 (refer to the tempo frequency
table)
¾ 4,5 Unused bits, read as ²0²
To enable/disable the tempo
6 counter (0=disabled;
1=enabled)
To enable/disable the D/A
output, sampling rate
7
counter and voice ROM
(0=disabled; 1=enabled)
TEMPO register
TEMPO CLK TEMPO BPM
30.5Hz
32.55Hz
34.88Hz
37.56Hz
40.69Hz
44.39Hz
48.83Hz
54.25Hz
61Hz
65.1Hz
69.8Hz
75.12Hz
81.38Hz
88.78Hz
97.66Hz
108.5Hz
TEMPO frequency table
HT827A0
68.3
72.8
78.0
84.0
91.0
99.3
109.3
121.4
136.6
145.7
156.1
168.1
182.1
198.6
218.5
242.8
March 15, 2000