III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
S1C33L03 FUNCTION PART
EPSON
B-III-9-1
A-1
B-III
I/O
III-9
INPUT/OUTPUT PORTS
The Peripheral Block has a total of 42 input/output ports. Although each pin is used for input/output from/to the
internal peripheral circuits, some pins can be used as general-purpose input/output ports unless they are used for
the peripheral circuits.
Input Ports (K Ports)
Structure of Input Port
The Peripheral Block contains 13 bits of input ports (K50 to K54, K60 to K67).
Figure 9.1 shows the structure of a typical input port.
Input interrupt
circuit
Kxx
KxxD
V
DDE
∗
1
∗
2
∗
1
AV
DDE
for K50 and K60–K67
∗
2
Available only for K50–K54
V
SS
Address
Internal data bus
Figure 9.1 Structure of Input Port
Each input-port pin is connected directly to the internal data bus via a three-state buffer. The state of the input
signal when read at an input port is directly taken into the internal circuit as data.
When K50 is used as an input port and K60 to K67 are used as general-purpose input ports, the power supply for
the port input buffers is AV
DDE
.
Therefore, when these ports are used as high-level or low-level input ports, the high level must be AV
DDE
, and the
low level V
SS
.
If there is a potential difference between AV
DDE
and V
DDE
, in particular, if the level from outside is V
DDE
, a
current may flow in the input buffer (when AV
DDE
> V
DDE
) or between V
DDE
and AV
DDE
(when AV
DDE
< V
DDE
).
Therefore, if these ports are not used, when the input level is fixed externally, it should be fixed at V
SS
or AV
DDE
.
The K50 port is provided with a pull-up resistance that pulls the port up to AV
DDE
.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
Page 4: ......
Page 14: ......
Page 15: ...S1C33L03 PRODUCT PART ...
Page 16: ......
Page 147: ...S1C33L03 FUNCTION PART ...
Page 148: ......
Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
Page 150: ......
Page 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
Page 164: ......
Page 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
Page 264: ......
Page 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
Page 416: ......
Page 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
Page 436: ......
Page 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
Page 494: ......
Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
Page 532: ......
Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
Page 580: ......