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參數資料
| 型號： | P89LPC920 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM |
| 中文描述： | 8位微控制器兩個小時80C51的核心2鍵盤/ 4 KB的/ 8 KB的3伏的低功耗Flash 256 - RAM的字節數據 |
| 文件頁數： | 14/45頁 |
| 文件大小： | 877K |
| 代理商： | P89LPC920 |
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Philips Semiconductors
P89LPC920/921/922
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 06 — 21 November 2003
14 of 45
9397 750 12285
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.
Functional description
Remark:
Please refer to the P89LPC920/921/922 User’s Manualfor a more detailed
functional description.
8.1 Enhanced CPU
The P89LPC920/921/922 uses an enhanced 80C51 CPU which runs at 6 times the
speed of standard 80C51 devices. A machine cycle consists of two CPU clock cycles,
and most instructions execute in one or two machine cycles.
8.2 Clocks
8.2.1
Clock definitions
The P89LPC920/921/922 device has several internal clocks as defined below:
OSCCLK —
Input to the DIVM clock divider. OSCCLK is selected from one of four
clock sources (see
Figure 5
) and can also be optionally divided to a slower frequency
(see
Section 8.7 “CPU Clock (CCLK) modification: DIVM register”
).
Note:
f
OSC
is defined as the OSCCLK frequency.
CCLK —
CPU clock; output of the clock divider. There are two CCLK cycles per
machine cycle, and most instructions are executed in one to two machine cycles (two
or four CCLK cycles).
RCCLK —
The internal 7.373 MHz RC oscillator output.
PCLK —
Clock for the various peripheral devices and is CCLK/2
8.2.2
CPU clock (OSCCLK)
The P89LPC920/921/922 provides several user-selectable oscillator options in
generating the CPU clock. This allows optimization for a range of needs from high
precision to lowest possible cost. These options are configured when the FLASH is
programmed and include an on-chip watchdog oscillator, an on-chip RC oscillator, an
oscillator using an external crystal, or an external clock source. The crystal oscillator
can be optimized for low, medium, or high frequency crystals covering a range from
20 kHz to 12 MHz.
8.2.3
Low speed oscillator option
This option supports an external crystal in the range of 20 kHz to 100 kHz. Ceramic
resonators are also supported in this configuration.
8.2.4
Medium speed oscillator option
This option supports an external crystal in the range of 100 kHz to 4 MHz. Ceramic
resonators are also supported in this configuration.
8.2.5
High speed oscillator option
This option supports an external crystal in the range of 4 MHz to 12 MHz. Ceramic
resonators are also supported in this configuration.
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