 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
M306V2EEFS датащи(PDF) 23 Page - Renesas Technology Corp |
|
|
|||||||||||||||||||||||||||||
M306V2EEFS датащи(HTML) 23 Page - Renesas Technology Corp |
|
|
23 / 271 page  Rev.1.40 Oct 06, 2004 page 23 of 269 M306V2ME-XXXFP, M306V2EEFP 2.4 Processor Mode 2.4.1 Types of Processor Mode One of three processor modes can be selected: single-chip mode, memory expansion mode, and micro- processor mode. The functions of some pins, the memory map, and the access space differ according to the selected processor mode. (1) Single-chip mode In single-chip mode, only internal memory space (SFR, OSD RAM, internal RAM, and internal ROM) can be accessed. Ports P0 to P10 can be used as programmable I/O ports or as I/O ports for the internal peripheral functions. (2) Memory expansion mode In memory expansion mode, external memory can be accessed in addition to the internal memory space (SFR, OSD RAM, internal RAM, and internal ROM). In this mode, some of the pins function as the address bus, the data bus, and as control signals. The number of pins assigned to these functions depends on the bus and register settings. (See “2.4.3 Bus Settings” for details.) (3) Microprocessor mode In microprocessor mode, the SFR, OSD RAM, internal RAM, and external memory space can be accessed. The internal ROM area cannot be accessed. In this mode, some of the pins function as the address bus, the data bus, and as control signals. The number of pins assigned to these functions depends on the bus and register settings. (See “2.4.3 Bus Settings” for details.) 2.4.2 Setting Processor Modes The processor mode is set using the CNVSS pin and the processor mode bits (bits 1 and 0 at address 000416). Do not set the processor mode bits to “102”. Regardless of the level of the CNVSS pin, changing the processor mode bits selects the mode. Therefore, never change the processor mode bits when changing the contents of other bits. Also do not attempt to shift to or from the microprocessor mode within the program stored in the internal ROM area. (1) Applying VSS to CNVSS pin The microcomputer begins operation in single-chip mode after being reset. Memory expansion mode is selected by writing “012” to the processor mode is selected bits. (2) Applying VCC to CNVSS pin The microcomputer starts to operate in microprocessor mode after being reset. Figures 2.4.1 and 2.4.2 show the processor mode register 0 and 1. Figure 2.4.3 shows the memory maps applicable for each of the modes. |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
