Fujitsu MB90480 Series Hardware Manual page 529

CHAPTER 24 EXAMPLES OF MB90F481B/MB90F482B/MB90F488B/MB90F489B SERIAL PROGRAMMING
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Pins used for Fujitsu standard serial on-board writing
Table 24.1-1 shows the functions of the related pins used for Fujitsu Standard serial on-board
writing.
Table 24.1-1 Function of pins
Pin
MD2, MD1,
Mode pin
MD0
X0, X1 Oscillation pin
Programming program
P80, P81
start pin
RST Reset pin
SIN0 Serial data input pin
SOT0 Serial data output pin
SCK0 Serial clock input pin
V Power voltage supply pin
CC
V GND pin
SS
Note:
To use the P80, P81, SIN0, SOT0, and SCK0 pins within the user system as well, the control circuit
shown in the Figure 24.1-2 is required.
Using the flash microcontroller programmer's "/TICS" signal for outputting "L", the user circuit can
be disconnected in serial programming mode. Refer to the connection example.
AF220/AF210/AF120/AF110
AF220/AF210/AF120/AF110
Function
Setting MD2=1, MD1=1, and MD0=0 to enter the serial
programming mode.
As, in the serial programming mode, CPU internal operation
clock is the PLL clock multiplied-by-1, the internal operation
clock frequency is equal to the oscillation clock frequency.
Consequently, the frequencies that can be input to the high-
speed oscillation input pin for serial writing are from 4.5 to 25
MHz.
Input "L" level to P80, and "H" level to P81
Use UART0 for CLK sync mode.
Programming voltage (V
Must be shared with GND of the flash microcontroller
programmer.
Figure 24.1-2 Pin control circuit
Write control pin
4.7 kΩ
/TICS pin
Description
-
= 3.3 V ± 5%)
CC
MB90F481B, MB90F482B,MB90F488B,
MB90F489B
Write control pin
User
507