欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: MC68B912B32
廠商: Motorola, Inc.
英文描述: 2.5V 100ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference 3-SOT-23 -40 to 125
中文描述: 16位微控制器
文件頁數: 25/128頁
文件大小: 748K
代理商: MC68B912B32
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
25
5 Operating Modes and Resource Mapping
Eight possible operating modes determine the operating configuration of the MC68HC912B32. Each
mode has an associated default memory map and external bus configuration. After reset, most system
resources can be mapped to other addresses by writing to the appropriate control registers.
5.1 Operating Modes
The operating mode out of reset is determined by the states of the BKGD, MODB, and MODA pins dur-
ing reset.
The SMODN, MODB, and MODA bits in the MODE register show current operating mode and provide
limited mode switching during operation. The states of the BKGD, MODB, and MODA pins are latched
into these bits on the rising edge of the reset signal. During reset an active pull-up is connected to the
BKGD pin (as input) and active pulldowns are connected to the MODB and MODA pins. If an open oc-
curs on any of these pins, the device will operate in normal single-chip mode.
There are two basic types of operating modes:
Normal modes — some registers and bits are protected against accidental changes.
Special modes — allow greater access to protected control registers and bits for special purposes such
as testing and emulation.
A system development and debug feature, background debug mode (BDM), is available in all modes.
In special single-chip mode, BDM is active immediately after reset.
5.1.1 Normal Operating Modes
These modes provide three operating configurations. Background debugging is available in all three
modes, but must first be enabled for some operations by means of a BDM command. BDM can then be
made active by another BDM command.
Normal Expanded Wide Mode
— This is a normal mode of operation in which the address and data
are multiplexed onto ports A and B. ADDR[15:8] and DATA[15:8] are present on port A. ADDR[7:0] and
DATA[7:0] are present on port B.
Normal Expanded Narrow Mode
— Port A is configured as the high byte of address multiplexed with
the 8-bit data bus. Port B is configured as the lower 8-bit address bus. This mode is used for lower cost
production systems that use 8-bit wide external EEPROMs or RAMs. Such systems take extra bus cy-
cles to access 16-bit locations but this may be preferred over the extra cost of additional external mem-
ory devices.
Table 9 Mode Selection
BKGD
0
0
0
0
1
1
1
1
MODB
0
0
1
1
0
0
1
1
MODA
0
1
0
1
0
1
0
1
Mode
Port A
Port B
Special Single Chip
Special Expanded Narrow
Special Peripheral
Special Expanded Wide
Normal Single Chip
Normal Expanded Narrow
Reserved (Forced to Peripheral)
Normal Expanded Wide
General-Purpose I/O
ADDR[15:8]/DATA[15:0]
ADDR/DATA
ADDR/DATA
General-Purpose I/O
ADDR[15:8]/DATA[15:0]
ADDR/DATA
General-Purpose I/O
ADDR[7:0]
ADDR/DATA
ADDR/DATA
General-Purpose I/O
ADDR[7:0]
ADDR/DATA
相關PDF資料
PDF描述
MC68C912B32FU8 16-Bit Microcontroller
MC68B912B32FU8 16-Bit Microcontroller
MC68C912B32CFU8 16-Bit Microcontroller
MC68CK338 Highly Integrated, Low-Power, 32-Bit Microcontroller
MC68EC060 32-Bit Microprocessors.(32位微處理器)
相關代理商/技術參數
參數描述
MC68B912B32FU8 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Microcontroller
MC68BOOL 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68BOOP 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68BOOS 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU)
MC68C812A4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Technical Supplement MC68C812A4 3.3V Electrical Characteristics
主站蜘蛛池模板: 普格县| 江川县| 丘北县| 抚顺市| 德钦县| 彩票| 邓州市| 诏安县| 宁陕县| 天祝| 达拉特旗| 丹东市| 顺平县| 澎湖县| 南郑县| 玉龙| 惠州市| 朝阳市| 海淀区| 祁东县| 宝清县| 贡觉县| 津南区| 泽州县| 彭山县| 静宁县| 辽源市| 陆河县| 商南县| 宁夏| 慈利县| 威信县| 贵州省| 府谷县| 兴义市| 白银市| 乐清市| 海城市| 陇南市| 连云港市| 托克托县|