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參數資料
| 型號： | HT9480 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Pager Controller |
| 中文描述： | 傳呼機控制器 |
| 文件頁數： | 20/57頁 |
| 文件大小： | 1541K |
| 代理商： | HT9480 |
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Timer/event counter
Programmable tone generator
In the case of the programmable timer counter
and a timer/event counter OFF condition, writ-
ing data to their preload registers also reloads
that data to their counters. But if the program-
mable timer counter or the timer/event counter
is turned on, data written to the counter is kept
only in its preload register, and the counter still
goes on operating until an overflow occurs.
After the counter (reading TMR0 or TMR1) is
read, the clock is blocked to avoid errors. The
programmer should take clock blocking into
consideration, since this may result in timing
counting errors.
Programmable tone generator
The programmable tone generator is imple-
mented in the HT9480. The programmable tone
generator contains an 8-stage programmable
frequency divider (mapping to the 1DH address
of the
μ
C), a 4-stage programmable frequency
prescaler (set by SPF10 and SPF11), and a fre-
quency source selector (set by SPF17). When
1DH=00H, the tone generator is disabled and
BZ outputs high. But when 1DH is of any value
greater than zero the generator is enabled. The
value of the frequency divider, ranging from
2~256, is always greater than the assigned
value by 1. The output of the 8-stage divider
is
divided
by 2 to generate an output of (1/2 or 1/4)
duty cycle on BZ. The 4-stage programmable
frequency prescaler is shown below.
SPF 10 SPF 11 Prescaler Divider F actor
0
0
0
1
1
0
1
1
1
2
4
8
The above setting of the prescaler divider factor
is designed for applications on melodies or
sound effects.
The frequency source selector is set by SPF17.
When SPF17=0, the value of the frequency
source selector is the system clock. On the other
hand, when SPF17=1, the value of the selector
turns out to be 32.768kHz. For instance, if the
HT9480
20
23th Feb ’98
相關PDF資料 |
PDF描述 |
|---|---|
| HT95168 | Caller ID Telephone IC |
| HT9580 | Character Pager Controller |
| HT95A30P | 8-Bit LCD Type Phone Controller MCU |
| HT95L300 | 8-Bit LCD Type Phone Controller MCU |
| HT95A20P | 8-Bit LCD Type Phone Controller MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT9480_02 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Numerical Pager Controller MCU |
| HT94804 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Numeric Pager Controller ??(Simplified Chinese Version Only) |
| HT-95 | 制造商:FCI 功能描述:RATCHET CRIMP TOOL 制造商:FCI 功能描述:RATCHET CRIMP TOOL; Crimp Size:32AWG to 22AWG; For Use With:Crimp-to-Wire PV Receptacles & Pins ;RoHS Compliant: NA |
| HT95168 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Caller ID Telephone IC |
| HT9580 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Character Pager Controller |
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