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PDF W78C438C Data sheet ( Hoja de datos )
| Número de pieza | W78C438C | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | nuvoton | |
| Logotipo |  |
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W78C438C Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION.......................................................................................................... 2
2. FEATURES ................................................................................................................................. 2
3. PIN CONFIGURATIONS............................................................................................................. 3
4. PIN DESCRIPTION..................................................................................................................... 4
5. FUNCTIONAL DESCRIPTION.................................................................................................... 6
5.1 Dedicated Data and Address Port .................................................................................. 6
5.2 Additional I/O Port ........................................................................................................... 8
5.3 Additional External Interrupt............................................................................................ 8
5.4 Newly Added Special Function Registers ..................................................................... 10
5.5 Power Reduction Function ............................................................................................ 10
5.6 Programming Difference............................................................................................... 11
6. ELECRICAL CHARACTERISTICS ........................................................................................... 12
6.1 Absolute Maximum Ratings .......................................................................................... 12
6.2 D.C. Characteristics ...................................................................................................... 12
6.3 A.C. Characteristics ...................................................................................................... 13
6.3.1 Clock Input Waveform....................................................................................................13
6.3.2 Program Fetch Cycle......................................................................................................13
6.3.3 Data Memory Read/Write Cycle.....................................................................................14
7. TIMING WAVEFORMS ............................................................................................................. 15
7.1 Program Fetch Cycle .................................................................................................... 15
7.2 Data Memory Read/Write Cycle ................................................................................... 16
8. TYPICAL APPLICATION CIRCUITS......................................................................................... 17
8.1 Using 128K × 8 bit External EPROM (W27E010)......................................................... 17
9. PACKAGE DIMENSIONS ......................................................................................................... 19
9.1 100-pin QFP.................................................................................................................. 19
10. REVISION HISTORY ................................................................................................................ 20
Publication Release Date: March 10, 2010
- 1 - Revision A7
1 page  
W78C438C
P8.0−P8.7 I/O Port
Functions are the same as those of Port 1 in the W78C31, except that they are mapped by the P8
register and not bit-addressable. The P8 register is not a standard register in the W78C32. Its address
is at 0A6H.
INT2 , INT3 External Interrupt, Input
Functions are similar to those of external INT0 , INT1 in the W78C32, except that the
functions/status of these interrupts are determined/shown by the bits in the XICON (External Interrupt
Control) register. The XICON register is bit-addressable but is not a standard register in the W78C32.
Its address is at 0C0H. For details, see the Functional Description below.
EA External Address, Input
Functions same as W78C32.
RST, XTAL1, XTAL2, PSEN , ALE
Functions same as W78C32.
Publication Release Date: March 10, 2010
- 5 - Revision A7
5 Page 
W78C438C
5.6 Programming Difference
The W78C438C is programmed in the same way as the W78C32, except that the external data RAM
is accessed by a "MOVX @Ri" instruction. To support address paging, there is an additional 8-bit SFR
"HB" (high byte), which is a nonstandard register, at address 0A1H. During execution of the "MOVX
@Ri" instruction, the contents of HB are output to AP6. The page address is modified by loading the
HB register with a new value before execution of the "MOVX @Ri" instruction. To read/write the HB
register, one can use the "MOV direct" instruction or "read-modify-write" instructions. The HB register
does not support bit-addressable instructions.
[Example].
MOV
MOV
MOVX
MOV
MOVX
R1, #0H
; R1 = 0.
0A1H, #0FFH ; HB contents FFH.
A, @R1
; Read the contents of external RAM location FF00H into
; Accumulator.
0A1H, #12H ; HB contents 12H.
@R1, A
; Copies the contents of Accumulator into external RAM
; location 1200H.
- 11 -
Publication Release Date: March 10, 2010
Revision A7
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet W78C438C.PDF ] | |
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