參數(shù)資料
型號: Z86U18
廠商: ZiLOG, Inc.
英文描述: USB Device Controller(鍵盤及其它外設(shè)的理想的USB微控制器)
中文描述: USB設(shè)備控制器(鍵盤及其它外設(shè)的理想的的USB微控制器)
文件頁數(shù): 14/31頁
文件大?。?/td> 311K
代理商: Z86U18
Z86E18/U18
1.5 MBPS USB Device Controller for Keyboards and HID-Class Peripherals
Zilog
14
P R E L I M I N A R Y
DS97KEY2301
FUNCTIONAL DESCRIPTION
(Continued)
Counter/Timers.
There is an 8-bit programmable
counter/timer (T0) driven by its own 6-bit programmable
prescaler (Figure 13).
The 6-bit prescaler can divide the input frequency of the
clock source by any integer number from 1 to 64. The pres-
caler drives the counter, which decrements the counter
value (1 to 256) on the prescaler overflow. When both the
counter and prescaler reach the end of count, a timer inter-
rupt request, IRQ4, is generated.
The counter can be programmed to start, stop, restart to
continue, or restart from the initial value. The counter can
also be programmed to stop upon reaching zero (single
pass mode) or to automatically reload the initial value and
continue counting (modulo-n continuous mode) The
counter, but not the prescaler, is read at any time without
disturbing its value or count mode.
Figure 13. Counter/Timers Block Diagram
PRE0
Initial Value
Register
T0
Initial Value
Register
T0
Current Value
Register
6-Bit
Down
Counter
8-bit
Down
Counter
÷
4
IRQ4
Write
Write
Read
Internal Data Bus
OSC
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