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GMS82524TK View Datasheet(PDF) - Hynix Semiconductor

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Description
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GMS82524TK
Hynix
Hynix Semiconductor Hynix
GMS82524TK Datasheet PDF : 93 Pages
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HYUNDAI MicroElectronics
GMS82512/16/24
R4 and R4DD register: R4 is an 5-bit CMOS bidirection-
al I/O port (address 0C8H). Each I/O pin can independently
used as an input or an output through the R4DD register
(address 0C9H).
R4 Data Register
R4
---
ADDRESS: 0C8H
RESET VALUE: Undefined
R44 R43 R42 R41 R40
Input / Output data
R4 Direction Register
R4DD - - -
ADDRESS: 0C9H
RESET VALUE: 00H
Port Direction
0: Input
1: Output
R4 Port Mode Register
PMR4 - - - 4
ADDRESS: 0D0H
RESET VALUE: 00H
3 21 0
0: R40
1: INT0
0: R41
1: INT1
0: R42
1: INT2
0: R43
1: INT3
0: R44
1: EC0
Edge Selection Register
IEDS 7 6 5 4 3
ADDRESS: 0F8H
RESET VALUE: 00H
21 0
INT3
INT2
INT1
INT0
External Interrupt Edge Select
00: Reserved
01: Falling (1-to-0 transition)
10: Rising (0-to-1 transition)
11: Both (Rising & Falling)
In addition, Port R4 is multiplexed with various special
features. The control register PMR4 (address 0D0H) con-
trols the selection of alternate function. After reset, this
value is “0”, port may be used as normal I/O port.
To use alternate function such as external interrupt or ex-
ternal counter input, write “1” in the corresponding bit of
PMR4.
Port Pin
R40
R41
R42
R43
R44
Alternate Function
INT0 (External Interrupt 0)
INT1 (External Interrupt 1)
INT2 (External Interrupt 2)
INT3 (External Interrupt 3)
EC0 (External count input to Timer/
Counter 0)
Regardless of the direction register R4DD, PMR4 is select-
ed to use as alternate functions, port pin can be used as a
corresponding alternate features.
FEB. 2000 Ver 1.00
29
 

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