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36 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (System Controller and Bus Control)
5.2.6 Control of system controller
Table 5.2.6.1 shows the control bits for the system controller.
Table 5.2.6.1 System controller control bits
SR R/W10Address Bit Name Function Comment
00FF00
(MCU)
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bus mode
CPU mode
R/W register
R/W register
R/W register
CE2 (R32)
CE1 (R31)
CE0 (R30)
Reserved register
In Single chip mode,
these setting are fixed
at DC output.
CE signal output
DC (R3x) output
Expansion
Maximum
1
1
1
CE2 enable
CE1 enable
CE0 enable
Single chip
Minimum
0
0
0
CE2 disable
CE1 disable
CE0 disable
BUSMOD
CPUMOD
–
–
–
CE2
CE1
CE0
CE signal output Enable/Disable
Enable:
Disable:
00FF00
(MPU)
D7
D6
D5
D4
D3
D2
D1
D0
1
0
0
0
0
0
0
1
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bus mode
CPU mode
R/W register
R/W register
R/W register
CE2 (R32)
CE1 (R31)
CE0 (R30)
Expansion mode only
Reserved register
Expansion
Maximum
1
1
1
CE2 enable
CE1 enable
CE0 enable
–
Minimum
0
0
0
CE2 disable
CE1 disable
CE0 disable
BUSMOD
CPUMOD
–
–
–
CE2
CE1
CE0
CE signal output Enable/Disable
Enable:
Disable:
00FF01 D7
D6
D5
D4
D3
D2
D1
D0
SPP7
SPP6
SPP5
SPP4
SPP3
SPP2
SPP1
SPP0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Stack pointer page address
< SP page allocatable address >
• Single chip mode:
• Expansion mode:
1
1
1
1
1
1
1
1
(MSB)
(LSB)
00FF02 D7
D6
D5
D4
D3
D2
D1
D0
EBR
WT2
WT1
WT0
CLKCHG
SOSC3
–
–
0
0
0
0
1
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BREQ
BACK
OSC3
On
1
1
WT2
1
1
1
1
0
0
0
0
WT1
1
1
0
0
1
1
0
0
WT0
1
0
1
0
1
0
1
0
Number
of state
14
12
10
8
6
4
2
Input port
Output port
OSC1
Off
0
0
Bus release enable register
(K03 and R33 terminal specification)
Wait control register
CPU operating clock switch
OSC3 oscillation On/Off control
R/W register
R/W register
No wait
Reserved register
K03
R33
only 0 page
0–27H page
CE signal output
DC (R3x) output
Note:
____
All the interrupts including NMI are disabled, until you write the optional value into both the "00FF00H" and
"00FF01H" addresses.