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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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Z8F021ASH020SC 数据表(PDF) 195 Page - Zilog, Inc. |
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Z8F021ASH020SC 数据表(HTML) 195 Page - Zilog, Inc. |
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195 / 276 page  PS022815-0206 On-Chip Debugger Z8 Encore! XP® 4K Series Product Specification 176 Data can be read 1–65536 bytes at a time (65536 bytes can be read by setting size to 0). If the device is not in DEBUG mode or if the Flash Read Protect Option bit is enabled, this command returns FFH for the data. DBG ← 0BH DBG ← Program Memory Address[15:8] DBG ← Program Memory Address[7:0] DBG ← Size[15:8] DBG ← Size[7:0] DBG → 1-65536 data bytes • Write Data Memory (0CH)—The Write Data Memory command writes data to Data Memory. This command is equivalent to the LDE and LDEI instructions. Data can be writ- ten 1–65536 bytes at a time (65536 bytes can be written by setting size to 0). If the device is not in DEBUG mode or if the Flash Read Protect Option bit is enabled, the data is dis- carded. DBG ← 0CH DBG ← Data Memory Address[15:8] DBG ← Data Memory Address[7:0] DBG ← Size[15:8] DBG ← Size[7:0] DBG ← 1-65536 data bytes • Read Data Memory (0DH)—The Read Data Memory command reads from Data Mem- ory. This command is equivalent to the LDE and LDEI instructions. Data can be read 1 to 65536 bytes at a time (65536 bytes can be read by setting size to 0). If the device is not in DEBUG mode, this command returns FFH for the data. DBG ← 0DH DBG ← Data Memory Address[15:8] DBG ← Data Memory Address[7:0] DBG ← Size[15:8] DBG ← Size[7:0] DBG → 1-65536 data bytes • Read Program Memory CRC (0EH)—The Read Program Memory CRC command computes and returns the Cyclic Redundancy Check (CRC) of Program Memory using the 16-bit CRC-CCITT polynomial. If the device is not in DEBUG mode, this command re- turns FFFFH for the CRC value. Unlike most other OCD Read commands, there is a delay from issuing of the command until the OCD returns the data. The OCD reads the Program Memory, calculates the CRC value, and returns the result. The delay is a function of the Program Memory size and is approximately equal to the system clock period multiplied by the number of bytes in the Program Memory. DBG ← 0EH DBG → CRC[15:8] DBG → CRC[7:0] |
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