3886 datasheet(93/380 Pages) RENESAS

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HARDWARE

1-68

3886 Group User’s Manual

FLASH MEMORY MODE

The M38869FFAHP/GP has the flash memory mode in addition to

the normal operation mode (microcomputer mode). The user can

use this mode to perform read, program, and erase operations for

the internal flash memory.

The M38869FFAHP/GP has three modes the user can choose:

the parallel input/output and serial input/output mode, where the

flash memory is handled by using the external programmer, and

the CPU reprogramming mode, where the flash memory is

handled by the central processing unit (CPU). The following ex-

plains these modes.

(1) Flash memory mode 1 (parallel I/O mode)

The parallel I/O mode can be selected by connecting wires as

shown in Figures 68 and supplying power to the VCC and VPP

pins. In this mode, the M38869FFAHP/GP operates as an equiva-

lent of MITSUBISHI’s CMOS flash memory M5M28F101.

However, because the M38869FFAHP/GP’s internal memory has

a capacity of 60 Kbytes, programming is available for addresses

0100016 to 0FFFF16, and make sure that the data in addresses

0000016 to 00FFF16 and addresses 1000016 to 1FFFF16 are FF16.

Note also that the M38869FFAHP/GP does not contain a facility to

read out a device identification code by applying a high voltage to

address input (A9). Be careful not to erratically set program condi-

tions when using a general-purpose PROM programmer.

Table 20 shows the pin assignments when operating in the paral-

lel input/output mode.

Table 20

Pin assignments of M38869FFAHP/GP when

operating in the parallel input/output mode

VCC

VPP

VSS

Address input

Data I/O

___

M38869FFAHP/GP

VCC

CNVSS

VSS

Ports P0, P1, P31

Port P2

P36

P37

P33

M5M28F101

VCC

VPP

VSS

A0–A16

D0–D7

___

Functional Outline (parallel input/output mode)

In the parallel input/output mode, the M38869FFAHP/GP allow the

user to choose an operation mode between the read-only mode

and the read/write mode (software command control mode) de-

pending on the voltage applied to the VPP pin. When VPP = VPPL,

the read-only mode is selected, and the user can choose one of

three states (e.g., read, output disable, or standby) depending on

___ ___

___

inputs to the CE, OE, and WE pins. When VPP = VPPH, the read/

write mode is selected, and the user can choose one of four states

(e.g., read, output disable, standby, or write) depending on inputs

___

to the CE, OE, and WE pins. Table 21 shows assignment states of

control input and each state.

q Read

The microcomputer enters the read state by driving the CE, and

___

OE pins low and the WE pin high; and the contents of memory

corresponding to the address to be input to address input pins

(A0–A16) are output to the data input/output pins (D0–D7).

q Output disable

The microcomputer enters the output disable state by driving the

___

CE pin low and the WE and OE pins high; and the data input/out-

put pins enter the floating state.

q Standby

The microcomputer enters the standby state by driving the CE pin

high. The M38869FFAHP/GP is placed in a power-down state

consuming only a minimal supply current. At this time, the data in-

put/output pins enter the floating state.

q Write

The microcomputer enters the write state by driving the VPP pin

___

high (VPP = VPPH) and then the WE pin low when the CE pin is

low and the OE pin is high. In this state, software commands can

be input from the data input/output pins, and the user can choose

program or erase operation depending on the contents of this soft-

ware command.

Mode

Read

Output disable

Standby

Read

Output disable

Standby

Write

Read-only

Read/Write

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

Table 21 Assignment sates of control input and each state

___

VIH

VIL

VPPL

VPPH

VPP

Output

Floating

Output

Floating

Input

Data I/O

Note:

× can be VIL or VIH.

State

FUNCTIONAL DESCRIPTION

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