MAX187EVKIT-DIP Maxim Integrated, MAX187EVKIT-DIP Datasheet - Page 17

• Manufacturer Part Number: MAX187EVKIT-DIP
• Description: Data Conversion IC Development Tools Programmers, Development Systems
• Manufacturer: Maxim Integrated
• Series: MAX187, MAX189r

Specifications of MAX187EVKIT-DIP

• Interface Type: QSPI, Serial (SPI, Microwire)
• Factory Pack Quantity: 1

The 68HC16 uses a phase-locked loop (PLL) to set its
bus speed. Crystal Y1 is a 32.768kHz frequency refer-
ence. The internal oscillator runs 256 times faster than the
external crystal. When the 68HC16 is reset, it waits for the
PLL to lock before it executes any software. After the PLL
locks onto the reference frequency, the software doubles
the clock speed by writing to the clock synthesizer con-
trol register, selecting a bus speed of 16.78MHz.
U5, the user RAM area, is a 32kbyte CMOS static RAM.
The 74HCT245 octal buffer lets the 68HC16 module
access an 8-bit port on the 40-pin interface connector.
This memory-mapped port consists of separate read
and write strobes, four chip selects, four address LSBs,
and eight data bits.
J3 is an RS-232 serial port, designed to be compatible
with the IBM PC 9-pin serial port. Use a straight-
through DB9 male-to-female cable to connect J3 to this
port. If the only available serial port has a 25-pin con-
nector, you may use a standard 25-pin to 9-pin
adapter. Table 8 shows the pinout of J3.
The MAX233 is an RS-232 interface voltage level shifter
with two transmitters and two receivers. It includes a
built-in charge pump with internal capacitors that gener-
ates the output voltages necessary to drive RS-232 lines.
The 20 x 2 pin header connects the 68HC16 module to
a Maxim EV kit. Table 9 lists the function of each pin.
Note that 68HC16 object code is not compatible with
68HC11 object code. Use the 68HC16 module only
with those modules that are designed to support it, and
only download code that is targeted for the 68HC16
module. Downloading incorrect object code into the
68HC16 module will have unpredictable results.
The 68HC16 µC generates various enable signals for dif-
ferent address ranges. The ROM and RAM enable sig-
nals are fed directly to the respective chips. Several
additional signals (J1.11–J1.14) are available on the data
connector to be used by Maxim EV kits. Table 10 out-
lines the address ranges for each of the elements found
on the 68HC16 module, and Table 11 is a truth table that
describes the logic for each of the 68HC16’s chip-select
outputs. Because the addresses are not completely
decoded, the boot ROM and user RAM have shadows.
MAX187 Evaluation System/Evaluation Kit
______________________________________________________________________________________
40-Pin Data Connector J1
Serial Communications
Address Ranges
Table 8. Serial Communications Port J3
Table 9. 40-Pin Data-Connector Signals
PIN
20–26
1
2
3
4
5
6
7
8
9
PIN
1–4
5, 6
7, 8
10
11
12
13
14
15
16
17
18
19
27
28
29
30
31
32
33
34
35
36
37
38
39
40
9
NAME
None
DCD
GND
RXD
DSR
TXD
DTR
CTS
RTS
VPREREG
EXTD1–7
PCS0/SS
CLKOUT
EXTD0
NAME
PWMA
7E000
7E800
7F000
7F800
MISO
MOSI
GND
VCC
OC1
OC2
OC3
OC4
SCK
A00
A01
A02
A03
WR
IC1
IC2
IC3
IC4
RD
Handshake; hard-wired to DTR and DSR
RS-232-compatible data output from
68HC16 module
RS-232-compatible data input to
68HC16 module
Handshake; hard-wired to DCD and DSR
Signal ground connection
Handshake; hard-wired to DCD and DTR
Handshake; hard-wired to CTS
Handshake; hard-wired to RTS
Unused
Ground
Unregulated input voltage
+5V from on-board regulator
Read strobe
Write strobe
Chip select for 7E000–7E7FF
Chip select for 7E800–7EFFF
Chip select for 7F000–7F7FF
Chip select for 7F800–7FFFF
Address bit 0 (LSB)
Address bit 1
Address bit 2
Address bit 3
Buffered data bus 0 (LSB)
Buffered data bus bits 1–7
General I/O port bit 0 (LSB)
General I/O port bit 1
General I/O port bit 2
General I/O port bit 3
General I/O port bit 4
General I/O port bit 5
General I/O port bit 6
General I/O port bit 7
QSPI master-in, slave-out
QSPI master-out, slave-in
QSPI serial clock
QSPI chip-select output
System clock output
Pulse-width-modulator output
FUNCTION
FUNCTION
17