C511_1 Datasheet, PDF (82/128 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Units
6.4.8 Register Description
6.4.8.1 SSC Control Register SSCCON
The bit addressable register SSCCON provides the basic control of the SSC functions like general
enable/disable, mode selections and transmitter control.
Special Function Registers SSCCON (Address E8H)
Reset Value : 07H
Bit No.
E8H
MSB
7
SCEN
6
TEN
LSB
5
4
3
2
1
0
MSTR CPOL CPHA BRS2 BRS1 BRS0
SSCCON
Bit
SCEN
TEN
MSTR
CPOL
Function
SSC System Enable
SCEN =0 : SSC subsystem is disabled, related pins are available as general I/O.
SCEN=1 : SSC subsystem is enabled.
Slave Mode - Transmitter enable
TEN =0
: Transmitter output STO will remain in tristate state,
regardless of the state of SLS.
TEN=1 and SLS =0 : Transmitter will drive the STO output.
In master mode the transmitter will be enabled all the time, regardless of the setting
of TEN.
Master Mode Select
MSTR=0 : Slave mode is selected
MSTR=1 : Master mode is selected
This bit has to be set to the correct value depending on the hardware setup of the
system before the SSC will be enabled. It must not be modified afterwards. There
is no on-chip support for dynamic switching between master and slave mode
operation.
Clock Polarity
This bit controls the polarity of the shift clock and in conjunction with the CPHA bit
which clock edges are used for sample and shift.
CPOL=0 : SCLK idle state is low.
CPOL=1 : SCLK idle state is high.
Semiconductor Group
6-49