4-3
MSM66591/ML66592 User's Manual
Chapter 4 CPU Control Functions
4
4.1.1 Standby Control Register (SBYCON)
SBYCON is a 5-bit register that controls standby functions.
The stop code acceptor (STPACP) is an acceptor used to set STOP mode.
Figure 4-1 shows the configuration of SBYCON.
• STP (bit 0)
Writing n5H and nAH (n = 0–F) consecutively to STPACP will set the stop code
acceptor to "1". Setting the STP bit of SBYCON to "1" at that point will set the device
in stop mode. STP will be set to "0" if an interrupt request is generated or reset from
RES
pin input or reset by the WDT occurs, releasing stop mode. For details refer to
Section 4.1.2 [2], "Stop Mode." STPACP will be set to "0" at the same time stop
mode is entered.
• HLT (bit 1)
Setting the HLT (bit 1) of SBYCON to "1" will set the device in halt mode. HLT will be
set to "0" when an interrupt or reset from
RES
pin input occurs, releasing halt mode.
For details refer to Section 4.1.2 [1], "Halt Mode."
• FLT (bit 2)
If stop mode is entered when the FLT bit of SBYCON is set to "1", then ports, control
signals, and all other output pins will enter a high impedance state. At this time, the
prevention circuit operates so that a through current will not flow into the input circuits
of pins in high impedance status, even if the pin becomes open externally.
The through current prevention circuit, however, does not operate for external
interrupt pins (INT0–INT2) and for the clock input pins of event timers (ETMCK,
ECTCK), since they can be the factors that clear STOP mode. Therefore, through
current may flow into the input circuits of external interrupt pins (INT0–INT2) and into
the clock input pins of event timers (ETMCK, ECTCK). When the STOP mode is
entered by setting the FLT bit of SBYCON to "1", these pins should be fixed at "H" or
"L" level. However, if these pins are used as their primary function (input/output
port), the through current prevention circuit will operate, so it is not necessary to fix
them at a logic level.
When the STOP mode is cleared, all outputs for ports and control signals return to a
status immediately preceeding the STOP mode entered.
If the device enters STOP mode when FLT of SBYCON is set to "0" (that is, FLT =
"0", STP = "1"), the ports and all output pins, such as control signal output, maintain
the status at that time.
Fix pins that are in input mode to "H" or "L" level, regardless of the content of the FLT
bit.
Figure 4-1 Configuration of SBYCON
—
—
OST1
OST0
—
FLT
HLT
STP
7
6
5
4
3
2
1
0
"—" Indicates a bit that is not provided. "1" is read if a read instruction is executed.
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...
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Page 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...