EM78815
8-Bit Microcontroller
7.3.9 IOCB Port B I/O Control, External LCD Driver Interface
(for EMC 65x132)
7.3.9.1 Page 0 Port B I/O Control
Bit 7
IOCB7
R/W-1
Bit 6
IOCB6
R/W-1
Bit 5
IOCB5
R/W-1
Bit 4
IOCB4
R/W-1
Bit 3
IOCB3
R/W-1
Bit 2
IOCB2
R/W-1
Bit 1
IOCB1
R/W-1
Bit 0
IOCB0
R/W-1
Bit 0~Bit 7 (IOCB0~IOCB7) : Port B(0~7) I/O direction control register
0 → puts the relative I/O pin as output
1 → puts the relative I/O pin into high impedance
7.3.9.2 Page 1 External LCD Driver Controller
Bit 7
EXA17
R/W-0
Bit 6
CWPWR
R/W-0
Bit 5
Bit 4
Bit 3
CSS
Bit 2
CSSON
R/W-0
Bit 1
DIS
Bit 0
EXLCD
R/W-0
×
×
×
×
R/W-0
R/W-0
Bit 0(EXLCD) : External LCD driver enable/disable
0/1 → Port B, Port C normal IO/External LCD driver control (RE Page
2 LCD0, LCD1 = 1)
If EXLCD is equal to 0, Port B and Port C output are normal IO. When EXLCD is
equal to 1, Port B and Port C are switch to external LCD driver control pin. At this
time, when user executes a read or write Port B instruction, Port C timing
characteristic is shown below:
Tah
A0(PC4)
CS (PC0/PC1)
Taw
Tcyc
WR(PC2)/
Tcc
RD(PC3)
Tdh
Tds
Port B
Port B
Data
Data
Toh
Tacc
Fig. 26 Timing Characteristics of the External LCD Driver Data Read/Write
Product Specification (V2.4) 08.01.2004
(This specification is subject to change without further notice)
53
ELAN [ ELAN MICROELECTRONICS CORP ]
