Fujitsu FR60 Hardware Manual page 52

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Table of Contents

CHAPTER 2 HANDLING THE DEVICE

■ Pull-up Control

The AC specification will not be guaranteed if pull-up resistor is connected to pins that are used as external

In addition, ports for which pull-up resistor is connected will be disabled in stop mode with HIZ = 1 and for

hardware standby.

■ Clock Controller

When inputting the low level to INIT, allocate wait time to allow oscillation to stabilize.

■ Subclock Switching

Immediately after switching the clock source to subclock mode from the main clock, insert at least one

NOP instruction.

■ Bit Search Module

Only word access is supported for the BSD0, BSD1, and BDSC registers.

■ D-bus Memory

Because instruction fetch to the D-bus memory is not executed, do not set the code area in the D-bus

If instruction fetch to the D-bus memory is executed, incorrect data will be interpreted for the codes,

causing a runaway condition.

■ Low-power Consumption Mode

When sleep or stop mode is set, always read the same registers immediately after writing to the standby

control register (STCR).

Specifically, use the sequence given below.

In addition, after returning from standby mode, set the I flag, ILM, and ICR to branch to the interrupt

handler that causes the return.

#_CLKR ,r12)

#value_of_standby, r0)

#_STCR, r12)

// sub-clock mode

// Must insert NOP instruction

// set STOP/SLEEP bit

// Must read STCR

// after reading, go into standby mode

// Must insert NOP * 5

Mb91350a series