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3-1
MSM66591/ML66592 User's Manual
Chapter 3 CPU Architecture
3
3.
CPU Architecture
3.1
Memory Space
Program memory space and data memory space in MSM66591/ML66592 are set
independently. At reset, up to 64K bytes (small-sized memory model) can be accessed
for program memory space, and up to 6K bytes (MSM66591) or 8K bytes (ML66592) for
data memory space. By changing the setting of the memory size control register
allocated to the SFR, the program memory space can be expanded up to 128K bytes
(MSM66591) or 192K bytes (ML66592) (medium-sized memory model).
3.1.1 Memory Space Expansion
The memory size control register (MEMSCON) is a register allocated to the SFR area
and specifies the size of the memory space. The program memory space can be
expanded to 128K bytes (medium-sized memory model) by setting the LROM bit (bit 1)
to "1". (Write "0" to bit 0.)
To write to the LROM bit of MEMSCON, first write "5H" to the high-order 4 bits (low-
order 4 bits are arbitrary data) of the memory size accepter (MEMSACP) allocated to
the SFR area, then write "0AH" to them successively.
When an FJ or FCAL is executed with the LROM bit "0", an OP code trap is generated
and a reset occurs.
When data is written to the LROM bit (setting to "1"), an actual memory space expan-
sion is enabled after the instruction next to a LROM bit write instruction (setting to "1") is
executed.
7
6
5
4
3
2
1
0
—
—
—
—
—
—
LROM
"0"
MEMSCON
0
1
Program Memory
Space 64K bytes
Program Memory
Space 128K bytes
*1
"—" indicates a bit that is not provided.
"1" is read if a read instruction is executed.
"0" indicates a bit that is not provided.
"0" is read if a read instruction is executed.
Always write "0" to this bit for write.
*1 192K bytes for the ML66Q592
7
6
5
4
3
2
1
0
MEMSACP
Writing to MEMSCON
is enabled by writing
"5H" and "0AH"
succesively.
—
—
—
—
Содержание ML66592
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002 ...
Страница 15: ...Contents 12 ...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1 ...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2 ...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3 ...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture ...
Страница 102: ...CPU Control Functions Chapter 4 4 ...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions ...
Страница 112: ...Memory Control Functions Chapter 5 5 ...
Страница 113: ......
Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions ...
Страница 118: ...Port Functions Chapter 6 6 ...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7 ...
Страница 153: ......
Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE ...
Страница 156: ...Clock Generation Circuit Chapter 8 8 ...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9 ...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10 ...
Страница 165: ......
Страница 170: ...Flexible Timer FTM Chapter 11 11 11 ...
Страница 171: ......
Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM ...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12 ...
Страница 215: ......
Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function ...
Страница 224: ...PWM Functions Chapter 13 13 ...
Страница 225: ......
Страница 244: ...Baud Rate Generator Functions Chapter 14 14 ...
Страница 245: ......
Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions ...
Страница 264: ...Serial Port Functions Chapter 15 15 ...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16 ...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions ...
Страница 382: ...Transition Detector Functions Chapter 17 17 ...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions ...
Страница 388: ...Peripheral Functions Chapter 18 18 ...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19 ...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20 ...
Страница 397: ......
Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function ...
Страница 408: ...Bus Port Functions Chapter 21 21 ...
Страница 409: ......
Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions ...
Страница 414: ...Expansion Port Chapter 22 22 ...
Страница 415: ......
Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23 ...
Страница 421: ......
Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5 ...
Страница 432: ...RAM Monitor Function Chapter 24 24 ...
Страница 433: ......
Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function ...
Страница 442: ...25 Electrical Characteristics Chapter 25 ...
Страница 443: ......
Страница 458: ...Package Dimensions Chapter 26 26 ...
Страница 459: ......
Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions ...
Страница 462: ...Revision History Chapter 27 27 ...
Страница 463: ......
Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History ...