MC68HC705J2 Datasheet, PDF (48/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

Freescale Semiconductor, Inc.
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MC68JC705J2
VPP
4 MHz
19
1 ^IRQ/VPP
OSC1
2 _OSC2
10 M
15 pF
15 pF
PA0 ¹⁸
PA1 ¹⁷
PA2 ¹⁶
PA3 ¹⁵
PA4 ¹⁴
PA5 ¹³
PA6 ¹²
PA7 ¹¹
VDD
2764
D0
A0
D1
A1
D2
A2
D3
A3
D4
A4
D5
A5
D6
A6
D7
A7
CE
A8
OE
A9
MC14040B
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
S1 ^{10 k}
1F
20 _RESET
VDD
VDD ⁹
A10
Q11
A11
Q12
A12
RST CLK
VDD
8 _PB0
7 _PB1
PROGRAM
330
6 _PB2
S2
VERIFY
330
5 _PB3
10 k
4
PB4
3
PB5
VDD
10 k
10 k
VSS ¹⁰
12 3
CONNECT 2 AND 3 FOR
MC68HC705J2 NATIVE MODE.
CONNECT 1 AND 2 FOR
MC68HC05J1 EMULATION MODE.
Figure 8-1. Bootloader Circuit
The bootloader function begins when a rising edge occurs on the RESET pin while
the IRQ/V_PP pin is at V_PP, the PB1 pin is at logical one, and the PB0 pin is
grounded.
The PB2 pin selects the bootloader function, as the following table shows.
Table 8-1. Bootloader Function Selection
PB2
1
0
Bootloader Function
Program and Verify
Verify
BOOTLOADER MODE
8-2
Rev. 2
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