Maxim Integrated High-Speed Microcontroller - Manual (Page 27)

High-Speed Microcontroller User’s Guide
Rev: 062210 27 of 176
4.2.7 Data Pointer Select (DPS)
7 6 5 4 3 2 1 0
SFR 86h 0 0 0 0 0 0 0 SEL
R-0 R-0 R-0 R-0 R-0 R-0 R-0 RW-0
R = Unrestricted Read, W = Unrestricted Write, -n = Value after Reset
Bits 7-1 Reserved. These bits will read 0.
SEL
Bit 0 Data Pointer Select. This bit selects the active data pointer.
0 = Instructions that use the DPTR will use
DPL and DPH .
1 = Instructions that use the DPTR will use DPL1 and DPH1 .
4.2.8 Power Control (PCON)
7 6 5 4 3 2 1 0
SFR 87h SMOD_0 SMOD0 — — GF1 GF0 STOP IDLE
RW-0 RW-0 RW-0 RW-0 RW-0 RW-0
R = Unrestricted Read, W = Unrestricted Write, -n = Value after Reset
SMOD_0
Bit 7 Serial Port 0 Baud-Rate Doubler Enable. This bit enables/disables the serial baud-
rate doubling function for Serial Port 0.
0 = Serial Port 0 baud rate will be that defined by baud-rate generation equation.
1 = Serial Port 0 baud rate will be double that defined by baud-rate generation equation.
SMOD0
Bit 6 Framing Error-Detection Enable. This bit selects function of the
SCON0 .7 and
SCON1 .7 bits.
0 = SCON0 .7 and SCON1 .7 control the SM0 function defined for the SCON0 and
SCON1 registers.
1 = SCON0 .7 and SCON1 .7 are converted to the Framing Error (FE) flag for the
respective Serial Port.
Bits 5-4 Reserved. Read data is indeterminate.
GF1
Bit 3 General-Purpose User Flag 1. This is a general-purpose flag for software control.
GF0
Bit 2 General-Purpose User Flag 0. This is a general-purpose flag for software control.
STOP
Bit 1 Stop Mode Select. Setting this bit will stop program execution, halt the CPU oscillator,
and internal timers, and place the CPU in a low-power mode. This bit will always be
read as a 0. Setting this bit while the Idle bit is set will place the device in an undefined
state.
IDLE
Bit 0 Idle Mode Select. Setting this bit will stop program execution but leave the CPU
oscillator, timers, serial ports, and interrupts active. This bit will always be read as a 0.