HT48RA3 Datasheet, PDF (1/36 Pages) Holtek Semiconductor Inc – 8-Bit Remote Type OTP MCU

HT48RA3
8-Bit Remote Type OTP MCU
Features
· Operating voltage: 2.2V~3.6V
· 23 bidirectional I/O lines (max.)
· 1 interrupt input shared with an I/O line
· 8-bit programmable timer/event counter with overflow
interrupt and 8-stage prescaler (TMR0)
· 16-bit programmable timer/event counter and over-
flow interrupts (TMR1)
· On-chip crystal and RC oscillator
· Watchdog Timer
· 24K´16 program memory EPROM
(8K´16 bits´3 banks)
· 224´8 data memory RAM
· PFD supported
· HALT function and wake-up feature reduce power
consumption
· 8-level subroutine nesting
· Up to 1ms instruction cycle with 4MHz system clock at
V_DD=3V
· Bit manipulation instruction
· 16-bit table read instruction
· 63 powerful instructions
· All instructions in one or two machine cycles
· 28-pin SKDIP/SOP package
General Description
This device is an 8-bit high performance RISC-like MCU
designed for multiple I/O product applications. The de-
vice is particularly suitable for use in products such as
universal remote controller (URC). A HALT feature is in-
cluded to reduce power consumption. The data ROM
can be used to store codes of remote control.
Block Diagram
IN T /P . 0
P ro g ra m
EPRO M
P ro g ra m
C o u n te r
BP
STAC K
In te rru p t
C ir c u it
IN T C
In s tr u c tio n
R e g is te r
MP
M
U
X
D ATA
M e m o ry
In s tr u c tio n
D ecoder
T im in g
G e n e ra to r
O SC2
O SC1
RES
VDD
VSS
M UX
A LU
S h ifte r
STATU S
ACC
TM R 1C
M
U
TM R 1
X
fS Y S /4
TM R 1
TM R 0
TM R 0C
M
U
P r e s c a le r
fS Y S
X
TM R 0
E N /D IS
W D TS
M
fS Y S /4
W D T P r e s c a le r
W DT
U
X
W DT O SC
PAC PO RT A
PA
P.D
PBC _{PO RT B}
PB
P A 0~P A 7
P B 0~P B 7
PCC _{PO RT C}
PC
P C 0~P C 5
P.C
PO RT .
P.0
P.
Rev. 1.20
1
May 12, 2003