Peripheral Circuits And Their Operation; I/O Memory Map - Epson 0C88832 Technical Manual

5 PERIPHERAL CIRCUITS AND THEIR OPERATION (I/O Memory Map)
5 PERIPHERAL CIRCUITS AND
THEIR OPERATION
The peripheral circuits of the E0C88832/88862 is interfaced with the CPU by means of the memory
mapped I/O method. For this reason, just as with other memory access operations, peripheral circuits can
be controlled by manipulating I/O memory. Below is a description of the operation and control method for
each individual peripheral circuit.

5.1 I/O Memory Map

Address Bit Name
00FF00 D7 BSMD1
General-purpose register
D6 BSMD0
General-purpose register
D5 CEMD1
General-purpose register
D4 CEMD0
General-purpose register
D3 CE3
General-purpose register
D2 CE2
General-purpose register
D1 CE1
General-purpose register
D0 CE0
General-purpose register
00FF01 D7 SPP7
General-purpose register
D6 SPP6
General-purpose register
D5 SPP5
General-purpose register
D4 SPP4
General-purpose register
D3 SPP3
General-purpose register
D2 SPP2 General-purpose register
D1 SPP1 General-purpose register
D0 SPP0 General-purpose register
00FF02 D7 EBR General-purpose register
D6 WT2 General-purpose register
D5 WT1 General-purpose register
D4 WT0 General-purpose register
D3 CLKCHG CPU operating clock switch
D2 OSCC OSC3 oscillation On/Off control
D1 VDC1 Operating mode selection
D0 VDC0
00FF10 D7 – –
D6 – –
D5 – –
D4 LCCLK General-purpose register
D3 LCFRM
General-purpose register
D2 DTFNT
LCD dot font selection
D1 LDUTY
LCD drive duty selection
D0 SGOUT
General-purpose register
*1 When 1/8 duty has been selected by mask option, setting of this register becomes invalid.
Note) When debugging using the E0C88 Family debugging tools ICE88R (ICE88) and PRC88348,
all the interrupts including NMI are disabled until values are written to addresses "00FF00H"
and "00FF01H".
18
Table 5.1.1(a) I/O Memory map (00FF00H–00FF10H)
Function
VDC1 VDC0 Operating mode
×
1 High speed (V
0 1 Low power (V
0 0 Normal
1
1
1
1
OSC3
On
=3.3V)
D1
=1.3V)
D1
(V =2.2V)
D1
–
–
–
1
5 x 5 dots
1/16 duty
1
EPSON
0 SR R/W Comment
0 R/W
0 R/W
1 R/W
1 R/W
0 Reserved register
0 R/W
(Note)
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 Reserved register
0 R/W
(Note)
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 Reserved register
0 R/W
0 R/W
0 R/W
OSC1
0 R/W
Off
0 R/W
0 R/W
–
–
Constantry "0" when
–
–
being read
–
–
0 R/W
0 Reserved register
0 R/W
0 R/W
5 x 8 dots
0 R/W
1/32 duty *1
0 R/W
0 Reserved register
E0C88832/88862 TECHNICAL MANUAL