LOW COST, Small Size	Low Power, Simple to use
Single Chip HC11	PLCC-52 (HC11E series)
Use CPU_1A1 for development, then load a lower cost OTP HC11
PCT_3A7_C Info - Connections - Prices - Downloads
The PCT_3A7_C shown to the left is the predecessor of the CPU_1A1 on the right. It is still a useful, low cost single chip solution. Think of it as a single chip processor. Simply build your application around it. For CPU_1A1 information. Connection details - Pricing - Availability Notes A FEW DETAILS INTRODUCTION The PCT board led to the CPU_1A1. As a result, the configuration of the two boards is very similar. The I/O relates directly to the pin functions of the HC11 processor. The PCT board was originally used with the HC11E9 chip. The CPU_1A1 has significantly more memory and can be erased and reprogrammed repeatedly. The advantage of the PCT board is it's lower cost when working with smaller, mature program code. The HC11 has a good assortment of built in I/O, including SCI and SPI communications ports, 8 bit analog to digital conversion, a versatile timer system and basic digital I/O lines. Many of these are accessible on the PCT board. The HC11 is operated in single-chip mode. Devices like the 74HC595 can easily be connected to expand the available I/O capacity. PROGRAM DEVELOPMENT The HC11E series and HC11F1 are very similar in structure from a programming point of view. To develop program code for a single-chip HC11, you will need a way of simulating or emulating the chip. Windowed chips are available that can be erased under a powerful ultraviolet light. There are also single-chip HC11s available with 2K bytes of EEPROM. These support re-programming without the lengthy ultraviolet erase cycle. Another option is to use the CPU_1A1 with its Flash memory, more RAM and Buffalo monitor to develop program code for the single-chip HC11s. There are a number of suppliers of assemblers, compilers, simulators and emulators. Many of these are suitable for large project development, but not cost effective for small projects or for hobby or classroom experimentation. Motorola has available 2 low (ish) cost HC11 evaluation boards. The EVBU is very simple and of limited use due to its lack of available memory. The EVB is an excellent tool for single chip development. It has a lead and adapter that allow it to plug into the PCT socket. The EVB emulates a single chip HC11. The EVB has a minimum of 8K of RAM and the Buffalo monitor. FEATURES Small size = 67mm wide x 37mm deep x 13mm high (with jumpers) Mounting = 25 way, 0.1 inch pitch, single row right angle header pins Construction = single sided circuit board with standard through-hole components Clock = 8MHz crystal Mode = single-chip Power required = single 5 volt @ 20mA (average). No on board regulator Reset = Motorola 5 volt reset device included on board TO MAKE IT GO To make the PCT board operational you need a 5 volt regulated power supply and a pre-programmed HC11 single chip micro in a PLCC-52 package. PMB can supply details if required. CAUTION The micro will be destroyed if more than 5 volts is applied at any point except for pin 4 (PE1) which has an on board voltage divider. The micro will be destroyed if the power supply is reverse connected.

CONNECTIONS The following table shows the function assigned to each of the 25 connector pins. If you are not familiar with the HC11, the manual or data sheet will be required to sort out some of the meaning.

1	PE0	VIA 1K	analog input	.
2	PA7	direct connect	digital I/O	pulse acc.
3	+5 Volts	main power supply	.	.
4	PE1	voltage divider	analog input	can monitor 12 V source
5	0V	main power supply	.	common
6	.	.	.	NO PIN
7	PE2	direct connect	analog input	.
8	PE4	direct connect	analog input	.
9	PE5	direct connect	analog input	.
10	PE6	direct connect	analog input	.
11	PE7	direct connect	analog input	.
12	PD2	direct connect	digital I/O	SPI, MISO
13	PD3	direct connect	digital I/O	SPI, MOSI
14	PD4	direct connect	digital I/O	SPI, SCK
15	PD5	direct connect	digital I/O	SPI, SS
16	.	.	.	NO PIN.
17	PD0	direct connect	digital I/O	SCI, RXD
18	PA4	direct connect	digital I/O	OC4
19	PD1	direct connect	digital I/O	SCI, TXD
20	PA2	direct connect	digital I/O	IC1
21	PA3	direct connect	digital I/O	OC5
22	PA6	direct connect	digital I/O	OC2
23	PA1	direct connect	digital I/O	IC2
24	PA0	direct connect	digital I/O	IC3
25	PA5	direct connect	digital I/O	OC3

assembled modules			1 to 11	12 to 48	49 up
PCT_3A7_C, module (does not include CPU)	-	YTMPCT3A7CM	$20.00	$18.50	$16.00
PCT_3A7_C, pcb only (does not include components)	-	YTMPCT3A7CBM	$9.00	$8.50	$7.00

Files available for Download
Circuit Diagram (pdf)	.	.

NOTES: The EVBU and EVB are available through Motorola dealers. An assembler and other information are available from Motorola's web site. PMB can provide some support to users of the CPU_1A1. Numbering system CPU_1A1. "CPU_1" describes the product, "A" describes the board or module within the product, "1" describes the revision. Items are available under PMB standard terms and conditions of sale.

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last updated: 11 Feb 2003