4-4
MSM66591/ML66592 User's Manual
Chapter 4 CPU Control Functions
• OST0 (Bit 4) and OST1 (Bit 5)
OST0 (bit 4) and OST1 (bit 5) of SBYCON set the timing to the supply clock for the
CPU after the original oscillation clock oscillates when STOP mode is cleared by an
interrupt request.
OST1
Selected Clock Frequency
0
0
262144
0
1
131072
1
0
65536
1
1
Setting inhibited
OST0
Do not set both OST1 and OST0 to "1".
4.1.2 Operation in Each Standby Mode
[1]
HALT Mode
The MSM66591/ML66592 enter HALT mode if HLT (bit 1) of SBYCON is set to "1".
In HALT mode, the original oscillation clock operates, and the TBC, the WDT, the
flexible timer, serial ports, etc. also operate. However the clock supply to the CPU
stops, therefore instructions are not executed. All executions stop at the beginning of
the instruction following the one that set HLT (bit 1) of SBYCON to "1".
HALT mode is cleared when an interrupt request is generated, an
RES
pin is input, or
when reset by WDT occurs. If HALT mode is cleared by a non-maskable interrupt,
HALT mode is cleared unconditionally, and the CPU executes a non-maskable interrupt
process.
A maskable interrupt clears HALT mode if both an interrupt request flag (IRQ bit) and
an interrupt enable flag (IE bit) are "1".
After HALT mode is cleared, the maskable interrupt process is executed if the master
interrupt enable flag (MIE of PSW) is "1".
If the master interrupt enable flag (MIE of PSW) is "0", the instruction next to the
instruction that set the device to HALT mode (instruction that set HLT (bit 1) of
SBYCON to "1") is executed.
However, if, in a non-maskable interrupt routine, HALT mode is set and then cleared by
an interrupt request, the instruction following the instruction that set HALT mode is
executed. Also, if interrupt priority has been set (MIP = "1") and halt mode is entered
from within a high-priority interrupt routine, then halt mode can be released by interrupt
requests of lower priority but the lower priority interrupt process is not executed even
though MIE is "1". Instead the instruction following the instruction that set halt mode is
executed.
If HALT mode is cleared by a
RES
pin input or by the WDT, the CPU performs a reset
process.
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...