r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 439

Manufacturer Part Number

r8a77850anbg

Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family

Manufacturer

Renesas Electronics Corporation.

Manufacturer

BOSTOCK HK LIMITED

Part Number:

r8a77850anbgV

Manufacturer:

Renesas Electronics America

When software wait insertion is specified by CSnWCR, the external wait input signal, RDY, is

also sampled. The RDY signal sampling timing is shown in figure 11.10, where a single wait cycle

is specified as a software wait. The RDY signal is sampled at the transition from the Tw state to

the T2 state. Therefore, the assertion of the RDY signal has no effect in the T1 cycle or in the first

Tw cycle. The RDY signal is sampled on the rising edge of the clock.

(Wait Cycle Insertion by RDY Signal, RDY Signal Is Synchronous Input)

In this example, DACKn is active-high. (The circles indicate the sampling timing.)

(In reading)

(In reading)

(In writing)

(In writing)

: Sampling Timing

Figure 11.10 SRAM Interface Wait Timing

Rev.1.00 Jan. 10, 2008 Page 409 of 1658

11. Local Bus State Controller (LBSC)

REJ09B0261-0100