3-21
MSM66591/ML66592 User's Manual
Chapter 3 CPU Architecture
3
"0"
"0"
"0"
"0"
"0"
"0"
"0"
7
6
5
4
3
2
1
0
CSR
"0"
"0"
"0"
"0"
"0"
"0"
7
6
5
4
3
2
1
0
CSR
(MSM66591)
(ML66592)
3.2.5 Segment Register
The segment register consists of two 8-bit registers: code segment register (CSR) and
table segment register (TSR). It selects a segment in the program memory space.
Since the program memory space of MSM66591 has only two segments, segment 0
and segment 1, only bit 0 is valid for both the CSR and the TSR. Bits 1 to 7 are fixed to
"0".
Since the program memory space of ML66592 has only segments 0, 1 and 2, only bits
0 and 1 are valid for both the CSR and the TSR. Bits 2 to 7 are fixed to "0". (Do not
access segment 3.)
[1]
Code Segment Register (CSR)
CSR specifies the segment in the program memory space to which the program code
being executed belongs. CSR is given as an independent 8-bits register, and is not
assigned to the SFR area.
CSR can be reloaded by the FJ, FCAL, FRT, and RTI instructions and an interrupt. No
other methods can reload CSR. Since in the MSM66591 CSR has only one valid bit
while in the emulator for the MSM66591 CSR has two valid bits, specify either segment
0 or segment 1 when executing the FJ or FCAL instruction for MSM66591.
Since in the ML66592 segment 3 is not provided, specify segment 0, 1 or 2 when
executing the FJ or FCAL instruction (do not access segment 3).
Each segment is assigned offset addresses of 0 through 0FFFFH. The address calcula-
tion for determining the addressing target is performed by a 16-bit offset address, and
the resulting overflow and underflow are ignored, which therefore never results in
change in the CSR. Similarly, a PC overflow never updates the CSR. Therefore, without
the use of the CSR reloading method described above, a program execution does not
progress beyond the code segment boundary. The CSR value at reset is 00H.
When an interrupt is generated after the program memory space is extended to 128K
bytes (MSM66591) or 192K bytes (ML66592), the current CSR value, along with the
PC, is automatically saved onto the stack. Executing the RTI instruction returns the
saved value to CSR. (See Section 3.1.1, "Memory Space Expansion.")
Содержание MSM66591
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...
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Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...