C515C_9711 Datasheet, PDF (67/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515C
Special Function Register SYSCON (Address B1H)
Special Function Register IP1 (Address B9H)
MSB
Bit No. 7
6
5
4
3
B1H
– PMOD EALE RMAP –
Reset Value C515C-8R : X010XX01B
Reset Value C515C-8E : X010X001B
Reset Value : 0X000000B
LSB
2
1
0
CSWO XMAP1 XMAP0
SYSCON
Bit No. 7
6
5
4
3
2
1
0
B9H PDIR –
.5
.4
.3
.2
.1
.0 IP1
Bit
PMOD
PDIR
The shaded bits are not used for port selection.
Function
Port 5 mode selection
PMOD = 0 : Quasi-bidirectional port structure of port 5 is selected (reset value)
PMOD = 1 : Bidirectional port structure of port 5 is selected.
Direction register enable
PDIR = 0 : Port 5 register access is enabled (reset value)
PDIR = 1 : Direction register is enabled.
PDIR will automatically be cleared after the second machine cycle (S2P2) after
having been set.
Direction Register DIR5 (Address F8H)
Reset Value : FFH
MSB
LSB
Bit No. 7
6
5
4
3
2
1
0
F8H
.7
.6
.5
.4
.3
.2
.1
.0 DIR5
Bit
DIR5.7-0
Function
Port driver circuitry, input/output selection
Bit = 0 : Port line is in output mode
Bit = 1 : Port line is in input mode (reset value).
This register can only be read and written by software when bit PDIR (IP1) was set
one instruction before.
Semiconductor Group
6-4
1997-11-01