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MSM66591/ML66592 User's Manual
Chapter 3 CPU Architecture
3.1.4 Data Memory Access
Examples of memory access when a byte operation and a word operation are per-
formed to a data memory space by an instruction are shown below.
[1]
Byte Operation
In the case of a byte operation, the 8-bit data indicated by the address specified by an
instruction becomes the target.
[Example] LB A, [DP]: when content of DP is 0335H
[2]
Word Operation
In the case of a word operation, the target is 16-bit data with 8-bit data indicated by an
address in which the least significant bit (LSB) "0" (even address) becomes low-order
8-bit data, and 8-bit data indicated by an address in which LSB "1" (odd address)
becomes high-order 8-bit data.
16-bit data where low-order 8 bits are allocated in an odd address and high-order 8 bits
are allocated in an even address is inaccessible. (A boundary exists during word
operation.) Such a boundary does not exists in the program memory space.
[Example] L A, [DP]: when content of DP is 0334H (or 0335H)
In the avobe example, 16-bit data where low-order 8 bits are allocated in 0333H and high-
order 8 bits are allocated in 0334H is inaccessible.
0335H
0336H
0337H
0338H
0332H
0333H
0334H
15 ACC 0
0334H
0335H
0336H
0337H
0331H
0332H
0333H
15 ACC 0
0330H
Summary of Contents for MSM66591
Page 15: ...Contents 12...
Page 17: ......
Page 18: ...Overview Chapter 1 1...
Page 19: ......
Page 30: ...Description of Pins Chapter 2 2...
Page 31: ......
Page 44: ...CPU Architecture Chapter 3 3...
Page 45: ......
Page 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Page 102: ...CPU Control Functions Chapter 4 4...
Page 103: ......
Page 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Page 112: ...Memory Control Functions Chapter 5 5...
Page 113: ......
Page 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Page 118: ...Port Functions Chapter 6 6...
Page 119: ......
Page 152: ...Output Pin Control Pin OE Chapter 7 7...
Page 153: ......
Page 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Page 156: ...Clock Generation Circuit Chapter 8 8...
Page 157: ......
Page 160: ...Time Base Counter TBC Chapter 9 9...
Page 161: ......
Page 164: ...Watchdog Timer WDT Chapter 10 10...
Page 165: ......
Page 170: ...Flexible Timer FTM Chapter 11 11 11...
Page 171: ......
Page 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Page 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
Page 215: ......
Page 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Page 224: ...PWM Functions Chapter 13 13...
Page 225: ......
Page 244: ...Baud Rate Generator Functions Chapter 14 14...
Page 245: ......
Page 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Page 264: ...Serial Port Functions Chapter 15 15...
Page 265: ......
Page 348: ...A D Converter Functions Chapter 16 16...
Page 349: ......
Page 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Page 382: ...Transition Detector Functions Chapter 17 17...
Page 383: ......
Page 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Page 388: ...Peripheral Functions Chapter 18 18...
Page 389: ......
Page 392: ...External Interrupt Request Function Chapter 19 19...
Page 393: ......
Page 396: ...Interrupt Request Processing Function Chapter 20 20...
Page 397: ......
Page 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Page 408: ...Bus Port Functions Chapter 21 21...
Page 409: ......
Page 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Page 414: ...Expansion Port Chapter 22 22...
Page 415: ......
Page 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
Page 421: ......
Page 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Page 432: ...RAM Monitor Function Chapter 24 24...
Page 433: ......
Page 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Page 442: ...25 Electrical Characteristics Chapter 25...
Page 443: ......
Page 458: ...Package Dimensions Chapter 26 26...
Page 459: ......
Page 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Page 462: ...Revision History Chapter 27 27...
Page 463: ......
Page 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...