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參數(shù)資料
| 型號(hào)： | ELANSC300-33KC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 32-BIT, 33 MHz, MICROCONTROLLER, PQFP208 |
| 封裝： | SHRINK, PLASTIC, QFP-208 |
| 文件頁數(shù)： | 65/139頁 |
| 文件大?。?/td> | 1388K |
| 代理商： | ELANSC300-33KC |
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élanSC300 Microcontroller Data Sheet
65
P R E L I M I N A R Y
LCD, Local Bus, or Maximum ISA Bus
Controller
Depending on the configuration chosen, the
élanSC300 microcontroller’s pin functionality will differ.
The three different options are Internal CGA Controller,
Local Bus, and Maximum ISA Bus modes. The pin op-
tions are selected upon power-up reset. Only Internal
CGA, Local Bus, or Maximum ISA Bus mode is avail-
able in a particular design. Both Internal CGA and
Local bus modes do, however, provide a subset of the
ISA bus.
The three sets of pin descriptions are described in “Al-
ternate Pin Functions Selected Via Firmware” on page
71.
Internal CGA Controller Option
The internal video controller is fully 6845 compatible,
supporting up to 640 x 200 pixel LCD panels. This op-
tion supports an external 32-Kbyte SRAM for video
memory. The smallest subset of the ISA bus is avail-
able when using the internal CGA controller.
Local Bus Option
The local bus interface is integrated with the memory
controller and the ISA bus controller, and it permits fast
transfers to and from external local bus peripherals,
such as video controllers. The local bus option is basi-
cally an Am386SXLV microprocessor local bus with an
LDEV, LRDY, and CPUCLK added. Additional ISA bus
signals are available in this mode.
Maximum ISA Bus Option
The Maximum ISA option provides the most ISA bus
signals of any of the élanSC300 microcontroller bus
options. Since master cycles and ISA refresh are not
necessary in handheld designs, the élanSC300 micro-
controller does not provide these signals in any bus
mode. The SYSCLK output from the élanSC300 micro-
controller is a clock that is normally only used for the
external keyboard controller if one exists. This clock is
9.2 MHz and can be stopped completely.
This clock is not related to any of the ISA bus cycle tim-
ings. The ISA bus cycle timings vary depending on the
clock speed selected for the internal ISA bus clock.
Internal Resistors
The élanSC300 microcontroller’s internal pull-down
and pull-up resistors are approximately 100-K
±
50%
tolerance. They don’t provide the level of termination
that may be necessary to meet design noise margins or
the timing and termination requirements for different
bus specifications (e.g., ISA bus or local bus).
The internal pull-up and pull-down resistors only pro-
vide adequate termination for when the input is floating
and is in a very low noise environment, or for systems
where power consumption is too critical to allow for the
additional current associated with stronger pullups. Be-
cause of this, it is recommended that the designer use
the external pull-up and pull-down resistors (shown in
Table 26) on signals with critical timing or noise immu-
nity requirements. The external pull-up and pull-down
resistors are also recommended for additional design
margin, provided that space and power consumption
are not major issues.
Table 26.
External Resistor Requirements
Signal Name
Pin
No.
Internal CGA
Pull Up
Local Bus
Pull Up
Maximum ISA
Pull Up
Notes
Pull
Down
Pull
Down
Pull
Down
PIRQ0 (PIRQ0/IRQ3)
194
10K
10K
10K
PIRQ1 (PIRQ1/IRQ6)
193
10K
10K
10K
IRQ1
195
10K
10K
10K
IOCHRDY
192
1K
1K
1K
IOCS16 [LCDDL0]
196
1K[–]
1K[–]
1K[–]
1
MCS16 [LCDDL1]
197
1K[–]
1K[–]
1K[–]
1
IRQ14 [LCDDL2]
198
10K[–]
10K
10K
1
DTR/CFG1
92
100K
10K
100K
2
RTS/CFG0
93
100K
100K
10K
2
IORESET
140
10K
10K
10K
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| ELANSC300-33KI | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Highly Integrated, Low-Power, 32-Bit Microcontroller |
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