參數資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數: 135/152頁
文件大小: 897K
代理商: MC68HC05L25PB
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
83
Chapter 9
Time Base
9.1 Introduction
Time base is a 14-bit up-counter which is clocked by XOSC.
This 14-bit divider is initialized to $0078 only upon power-on reset (POR). After counting 16,264 clocks,
the STUP bit in the MISC register is set. See Figure 8-4 for more information.
9.2 Time Base Submodules
The clock divided by the time base is used for LCDCLK, STUP, TBI, and COP. The time base clock can
be provided either from OSC or XOSC.
9.2.1 LCDCLK
One of four clock frequency combinations can be selected for the LCD clock.
9.2.2 STUP
The time base divider is initialized to $0078 at power-on, and when the count reaches 16,264, the STUP
flag in the MISC register is set. Once the STUP flag is set, it is never cleared while power is applied.
9.2.3 TBI
Time base interrupt can be generated every 0.5, 0.25, 0.125, or 0.0039 seconds with a 32.768-kHz crystal
at XOSC pins. See Table 9-2.
Table 9-1. LCD Clock Frequency
TBCR1
Divide
Ratio
LCD Clock Frequency (Hz)
(fXOSC = 32.768 kHz)
TBCLK LCLK
OSC = 2.0 MHz
OSC = 4.0 MHz
OSC = 4.1943 MHz
00
XOSC
÷ 64
512
0
1
XOSC
÷ 28
256
10
OSC
÷ 8192
244
488
512
11
OSC
÷
16,384
122
244
256
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