MC80F0424 Datasheet, PDF (123/135 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0424/0432/0448
27.3 Hardware Conditions to Enter the ISP Mode
The In-System Programming (ISP) is performed without remov-
ing the microcontroller from the target system. The In-System
Programming(ISP) facility consists of a series of internal hard-
ware resources coupled with internal firmware through the serial
port. The In-System Programming (ISP) facility has made in-cir-
cuit programming in an embedded application possible with a
minimum of additional expense in components and circuit board
area. The boot loader can be executed by holding ALEB high,
RST/V_PP as +9V, and ACLK0 with the OSC. 1.8432MHz. The
ISP function uses five pins: TxD0, RxD0, ALEB, ACLK0 and
RST/V_PP.
V_DD(+5V)
+9V
X-TAL
V_DD 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
RST/V_{PP RESET} 19
X_IN 20
X_{OUT 21}
2MHz~12MHz
42
41
40
39
38
37
36
35
34 R47 / TxD0
33 R46 / RxD0
32 R45 / ACLK0
31
30
29
28
27
26
25
24
23 R30 ALE
22 V_SS
Tx Data
Rx Data
1.8432MHz
V_DD
Figure 27-1 ISP Configuration
Note: Considerations to implement ISP function in a user
target board
• The ACLK0 must be connected to the specifed
oscillator.
• Connect the +9V to RESET/Vpp pin directly.
• The ALEB pin must be pulled high.
• The main clk must be higher than 2MHz.
MAR. 2005 Ver 0.2
119