Port銆?80COM:銆?400 dot LCD driver + 24 Bit I/O Port銆戔€︺€?480 dot LCD driver + 48 Bit I/O Port銆?/div>
錛宱r
The configuration of LCD driver was selected from mask option銆侭uilt-in power regulator circuit錛宮ake
the LCD display more stable銆俆he built-in OP comparator can be used with (light, voice, temperature,
humility) sensor or battery low detection. A 7-bit current type D/A converter and PWM device provide the
complete speech output mechanism.銆俆he 2M byte ROM and 16K byte RAM can be used as the storage
of large speech data, graphic, text etc. It can be used for Dictionary, Data Bank, Medium Level
Educational Toy, Low duration Voice Recording System etc..
The instruction set are quite easy to learn and simple to use. There are only about thirty instructions
with four-type addressing modes are provided. Most of instructions take only 3 oscillator clocks (machine
cycles), which is the high efficiency and low power MCU.
B. HE847701 Features
2.4V 鈥?3.6V
4MHz ~ 8MHz
2M Bytes(256K Program ROM+1792K Data ROM)
16K Bytes
Normal(Fast) clock:
32.768K ~ 8MHz(No Internal Clock)
Slow clock:
32.768KHz
Operation mode: DUAL銆丗AST銆丼LOW銆両DLE銆乤nd SLEEP mode銆?/div>
New RC type oscillator錛宎ccuracy at 鹵5%錛宮aximum frequency up to around 10 MHz銆侾lease refer
to the detail frequency table on section F銆?/div>
With WDT (WATCH DOG TIMER) to prevent deadlock condition.銆?/div>
24~48 bit Bi-directional I/O port. Mask Option can select PUSH-PULL or OPEN DRAIN output
mode for each I/O pin.
The new built-in hardware auto scan keyboard(4*20)(shared with LCD SEG pin) not only reduce the
錛?/div>
hardware cost, but also reduce the firmware effort銆?/div>
Built-in OP comparator銆?/div>
User can select any one of three LCD configurations --- 32COM*128 SEG LCD錛?8COM*112 SEG
LCD, 64 COM*96 SEG, or 80 COM*80 SEG LCD銆俆he LCD scan signal are Type B(please refer
to HE80000 user鈥檚 manual, section 4.3.9 LCD control register), It is built-in type-IV LCD driver.
The highest LCD voltage LVP must be lower than 8.5Volt銆?/div>
Provide LFR and LDL output signal錛寃hich can be connected to KDS80錛宎s a LCD Segment
extension銆?/div>
LCDC[7:0]=[錛嶏紞錛岹
GGBE]銆侴
: gray level control銆丅 :blank(1)銆丒: enable(1)銆?/div>
The 847701 provide different refresh cycle for different display configuration: 32 COM : Refresh
Cycle=~170Hz錛?8 COM : Refresh Cycle=~110Hz
錛?4
COM : Refresh Cycle=~64Hz錛?0 COM :
1
Preliminary V1.0
Operation Voltage:
System Clock:
Internal ROM:
Internal RAM:
Dual clock system:
1
2
3
