IBM EM78P312N manual General Description, Features, Pin Assignment, Bit Microcontroller

EM78P312N

8-Bit Microcontroller

1 General Description

The EM78P312N is an 8-bit microprocessor with low-power, high-speed CMOS technology and high noise immunity. It has an on-chip 4K×13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides multi-protection bits to prevent intrusion of user’s OTP memory codes. Seven Option bits are also available to meet user’s requirements. With its OTP-ROM feature, the EM78P312N provides a convenient way of developing and verifying user’s programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using development and programming tools. User can avail of the ELAN Writer to easily program his development code.

2 Features

„CPU configuration

z4K⋅13 bits on-chip ROM

z144⋅8 bits on-chip registers (SRAM) z8-level stacks for subroutine nesting zLess than 3.5mA at 5V/8MHz

zTypically 0.8 μA, during sleep mode zTypically 1.1 μA, during idle mode

„I/O port configuration

z4 bidirectional I/O ports : P6, P7, P8, P9 z22 I/O pins

z10 Programmable pull-down I/O pins z10 programmable pull-high I/O pins

zExternal interrupt : P60, P61, P73, P80

„Operating voltage range: zOTP version

Operating voltage range:2.5v~5.5v

„Operating temperature range: z-40~85°C

„Operating frequency range: Main clock

•Crystal mode:

DC ~ 20MHz/2clks @ 5V; DC ~100ns inst. cycle @ 5V DC ~ 8MHz/2clks @ 3V;DC ~ 250ns inst. cycle @ 3V

•ERC mode:

DC ~ 16MHz/2clks @ 5V;DC ~ 125ns inst. cycle @ 5V DC ~ 8MHz/2clks @ 3V;DC ~ 250ns inst. cycle @ 3V

„Peripheral configuration

zSerial peripheral interface (SPI) available

zUniversal asynchronous receiver transmitter interface (UART)available

z16 bits Counter/Timer TC2: Timer/Counter/Window

z8 bits Timer/Counter

TCC: 8-bit real time clock/counter with overflow interrupt

TC3: Timer/Counter/Capture

TC4: Timer/Counter/ PWM (pulse width modulation) / PDO (Programmable divider output)

z8-bit channels Analog-to-Digital Converter with 10-bit resolution

zTime Base Timer:(1Hz~16kHz at 8MHz)

zKey tone output:(1kHz~8kHz at 8MHz)

z8-bit channels Analog-to-Digital Converter with 10-bit resolution

„Fifteen available interrupts:

zWDT time-out interrupt

zTCC overflow interrupt

zTime base timer interrupt (the first falling edge of the source clock)

zSerial UART transmit interrupt

zSerial UART receive interrupt

zSerial UART receive error interrupt

zFour External interrupt

zADC completion interrupt

zTC2 overflow interrupt

zTC3 overflow interrupt

zTC4 overflow interrupt

zSerial SPI interrupt

„Special features

zProgrammable free running watchdog timer

zTwo clocks per instruction cycle

zPower-on Reset

zHigh noise immunity

zPower saving Sleep mode

zSelectable Oscillation mode

„Package type:

z28-pin DIP 600 mil: EM78P312NP

z28-pin Skinny DIP 300 mil: EM78P312NAK

z28-pin Skinny DIP 400 mil: EM78P312N

z28-pin SOP 300 mil: EM78P312NM

z28-pin SSOP 209 mil: EM78P312NS

3	Pin Assignment
		(ACLK) OSCO	1	28	VDD
		OSCI	2	27	/RESET (VPP)
		TEST	3	26	P67 (DINCK)
		(AD0) P90	4	25	P66 (DATAIN)
		(AD1) P91	5	24	P65 (PGMB)
		(AD2) P92	6	23	P64 (/SS)(OEB)
		(AD3) P93	7	22	P63 (/TONE)
		(AD4) P94	8	21	P62 (TC2)
		(AD5) P95	9	20	P61 (INT1)
		(AD6) P96	10	19	P60 (/INT0)
		(AD7/VREF) P97	11	18	P73 (/SLEEP, /INT5)
		(TC3, INT3) P80	12	17	P72 (TX,SO)
		(TC4, /PWM, /PDO) P81	13	16	P71(RX,SI)
		VSS	14	15	P70 (/SCK)
			EM78P312N
		Fig. 3-	Pin Assignment
Product Specification (V1.0) 10.03.2006						• 1

(This specification is subject to change without further notice)