 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
M32C/8A 数据表(PDF) 71 Page - Renesas Technology Corp |
|
|
|||||||||||||||||||||||||||||
M32C/8A 数据表(HTML) 71 Page - Renesas Technology Corp |
|
|
71 / 372 page  M32C/8A Group 8. Bus Rev.1.00 Jul 15, 2007 Page 54 of 352 REJ09B0385-0100 8.2.3 Read/Write Output Signals When using a 16-bit data bus, the PM02 bit in the PM0 register selects either a combination of the “RD, WR, and BHE” outputs or the “RD, WRL, and WRH” outputs to determine the read/write output signals. When the DS3 to DS0 in the DS register are set to 0 (8-bit external data bus width), set the PM02 bit to 0 (RD/WR/BHE). When any of the DS3 to DS0 bits are set to 1 (16-bit external data bus width) to access an 8-bit space, the combination of “RD, WR, and BHE” is automatically selected regardless of the PM02 bit setting. Table 8.4 lists RD, WRL, and WRH outputs. Table 8.5 list RD, WR, and BHE outputs. The RD, WR, and BHE outputs are selected for the read/write output signals after reset. When changing to “RD, WRL, and WRH” outputs, set the PM02 bit first to write data to an external memory. Table 8.4 RD, WRL, and WRH Outputs NOTE: 1. These become WR output. Table 8.5 RD, WR, and BHE Outputs Data Bus Width RD WRL WRH A0 CPU Processing on External Space 16 bits L H H Not used Read data H L H Not used Write 1-byte data to even address H H L Not used Write 1-byte data to odd address H L L Not used Write data to both even and odd addresses 8 bits H L(1) Not used H/L Write 1-byte data LH(1) Not used H/L Read 1-byte data Data Bus Width RD WR BHE A0 CPU Processing on External Space 16 bits H L L H Write 1-byte data to odd address L H L H Read 1-byte data from odd address H L H L Write 1-byte data to even address L H H L Read 1-byte data from even address H L L L Write data to both even and odd addresses L H L L Read data from both even and odd addresses 8 bits H L Not used H/L Write 1-byte data L H Not used H/L Read 1-byte data |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 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 |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
