MC68HC908GR16 Datasheet, PDF (246/276 Pages) Motorola, Inc – Microcontrollers

Table 19-1. Monitor Mode Signal Requirements and Options
Mode
Serial
IRQ
RST
Reset
Vector
Communication
Mode
Selection
Divider
PLL
PTA0 PTA1 PTB0 PTB1 PTB4
COP
Communication
Speed
External
Bus
Baud
Clock Frequency Rate
Comments
—
X GND X
X
X
X
X
X
X
X
X
X
X Reset condition
V_DD
V_TST or
X
1
Normal
V_TST
Monitor
V_DD
V_TST or
X
1
V_TST
0
1
0
0
OFF Disabled
4.9152
MHz
2.4576
MHz
9600
0
1
0
1
OFF Disabled
9.8304
MHz
2.4576
MHz
9600
Forced
V_DD
V_DD
$FF
(blank)
1
Monitor
GND
V_DD
$FF
(blank)
1
0
X
X
X OFF Disabled 16 MHz 4 MHz 9600
0
X
X
X
ON Disabled
32.768
kHz
2.4576
MHz
9600
User
V_DD
or
GND
V_DD
or
V_TST
$FF
(blank)
X
V_DD V_DD Not
or or $FF
X
GND V_TST
X
X
X
X OFF Enabled
X
X
X
X
X
X Enabled
X
X
X
User mode —
illegal address reset
X
X
MON08
Function
[Pin No.]
V_TST
[6]
RST
[5]
—
COM
[8]
SSEL MOD0 MOD1 DIV4
[10] [12] [14] [16]
—
—
OSC1
[13]
—
—
1. PTA0 must have a pullup resistor to V_DD in monitor mode.
2. Communication speed in the table is an example to obtain a baud rate of 9600. Baud rate using external oscillator is bus frequency / 256.
3. External clock is an 32.768 kHz crystal on OSC1 and OSC2 or a 32.768 kHz, 4.9152 MHz, or 9.8304 MHz canned oscillator on OSC1.
4. X = don’t care
5. MON08 pin refers to P&E Microcomputer Systems’ MON08-Cyclone 2 by 8-pin connector.
NC 1
NC 3
NC 5
NC 7
NC 9
NC 11
OSC1 13
V_DD 15
2 GND
4 RST
6 IRQ
8 PTA0
10 PTA1
12 PTB0
14 PTB1
16 PTB4