Epson PX-8 Technical Manual page 70

6
3
0
3
G
A
H
4
0
S
S
E
D
1
3
2
0
I
GAH
40S
Address
OOOD
OOOE
OOOF
0010
0011
0012
0013
0014
0020
0021
0022
0023
0024
0025
0026
0027
0028
Read/
Function
Write
Input Capture register (up-
per 8 bits)
Input Capture register
(lower 8 bits)
Control/status register
Baudrate/Mode Control
register
TX and RX control/status
register
Receive data register
Transmit data register
RAM control register
Counter (upper byte) R
input
Counter reset
W
Counter (lower byte) R
Command register
W
P-ROM address (upper 8
byte)
W
P-ROM address (lower 8
W
byte)
P-ROM read data R
Controller instruction re-
W
gister
Controller data buffer R
Controller data buffer W
Controller status register R
Port data output register
(data)
W
Port data input register R
Port data output register
W
(command)
Interrupt enable register W
REV.-A
Bit
7
6
5 4 3 2 1 0
Bit15
Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8
Bit 7 Bit 6 Bit5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
FLAG
IRQ
OSS
LATCH
enable
-
enable
- -
-
Clock control Baudrate control
-
- - -
RDRF ORFE TDRE RIE RE TIE TE WU
MSB LSB
MSB LSB
~tand-b'r
RAM
power enable
- - - - -
-
CNTR Microcassette tape drive counter data
Count
-
-
Bit 1 2
I
Bit 11
Bit 10 Bit 9 Bit 8
i
-
- - - -
- -
-
Microcassette tape counter data
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 BitO
STOP
- -
SW
FAST
-
MTC MTB MTA SWPR
CNT
MCT
Upper P-ROM address bits
Bit 15
I
Bit 14
I
Bit 13
I
Bit 121 Bit 11
I
Bit 10
I
Bit 9
I
Bit 8
Upper P-ROM address bits
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 BitO
MSB LSB
SED 1320
•
6303
2-46