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PDF EM78458 Data sheet ( Hoja de datos )
| Número de pieza | EM78458 | |
| Descripción | 8-Bit Microcontroller | |
| Fabricantes | ELAN Microelectronics | |
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EM78458/459
8-Bit Microcontroller
with MASK ROM
Product
Specification
DOC. VERSION 1.4
ELAN MICROELECTRONICS CORP.
May 2005
1 page  
Contents
4.12.1 Oscillator Modes ..........................................................................................................43
4.12.2 Crystal Oscillator/Ceramic Resonators (XTAL)............................................................44
4.12.3 External RC Oscillator Mode .......................................................................................45
4.12.4 RC Oscillator Mode with Internal Capacitor.................................................................46
4.13 Power-on Considerations ............................................................................................ 47
4.13.1 External Power on Reset Circuit..................................................................................47
4.13.2 Residue-Voltage Protection .........................................................................................48
4.14 CODE OPTION............................................................................................................ 49
4.15 Instruction Set .............................................................................................................. 49
4.16 Timing Diagrams.......................................................................................................... 52
5 ABSOLUTE MAXIMUM RATINGS .......................................................................................53
6 ELECTRICAL CHARACTERISTICS ....................................................................................53
6.1 DC Electrical Characteristic(Ta=0°C ~ 70 °C, VDD=5.0V±5%, VSS=0V).................. 53
6.2 AC Electrical Characteristic (Ta=0°C ~ 70 °C, VDD=5V±5%, VSS=0V) .................... 54
6.3 A/D Converter Characteristic(Vdd=3.0V to 5.5V,Vss=0V,Ta=0 to 70℃) .................... 54
6.4 Comparator(OP) Characteristic(Vdd = 5.0V,Vss=0V,Ta=0 to 70℃) ........................... 55
APPENDIX
A Package Types .....................................................................................................................56
Product Specification (V1.4) 02.27.2005
•v
5 Page 
EM78458/459
8-Bit Microcontroller with MASK ROM
4 FUNCTION DESCRIPTION
WDT
Time-out
Oscillator/
Timming
Control
Prescaler
ENTCC
R1(TCC)
WDT Timer
/INT
Interrupt
Control
ROM
Instruction
Register
Sleep
&
Wake Up
Control
RAM
R4
Instruction
Decoder
PC
R3
STACK 0
STACK 1
STACK 2
STACK 3
STACK 4
STACK 5
STACK 6
STACK 7
ALU
ACC
Comparators
IOC5
R5
DATA & CONTROL BUS
2 PWMs
8 ADC
IOC6
R6
PPPPPPPP
55555555
01234567
PPPPPPPP
66666666
01234567
Fig. 2 The Functional Block Diagram of EM78458/459
4.1 Operational Registers
4.1.1 R0 (Indirect Addressing Register)
R0 is not a physically implemented register. Its major function is to perform as an
indirect addressing pointer. Any instruction using R0 as a pointer, actually accesses
data pointed by the RAM Select Register (R4).
4.1.2 R1 (Time Clock /Counter)
Increased by an external signal edge through the TCC pin, or by the instruction
cycle clock.
The signals to increase the counter are decided by Bit 4 and Bit 5 of the CONT
register.
Writable and readable as any other registers.
4.1.3 R2 (Program Counter) & Stack
R2 and hardware stacks are 12-bit wide. The structure is depicted in Fig. 4.
Generates 4K×13 bits on-chip ROM addresses to the relative programming
instruction codes. One program page is 1024 words long.
The contents of R2 are set to all "0"s upon a RESET condition.
Product Specification (V1.4) 05.27.2005
(This specification is subject to change without further notice)
•5
11 Page | ||
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