MC68HC908GZ8 Datasheet, PDF (153/344 Pages) Motorola, Inc – Microcontrollers

Table 15-1. 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 MHz
2 MHz
7200
0
1
0
1 OFF Disabled 8 MHz
2 MHz
7200
Forced
Monitor
V_DD
or
V_DD
$FF
(blank)
1
GND
0
X
X
X OFF Disabled 8 MHz
2 MHz 7200
V_DD V_DD Not
User
or or $FF
X
GND V_TST
X
X
X
X
X Enabled
X
X
X
MON08
Function
[Pin No.]
V_TST
[6]
RST
[4]
—
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 7200. Baud rate using external oscillator is bus frequency / 278.
3. External clock is an 4 MHz or 8 MHz crystal on OSC1 and OSC2 or a 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