HD6433637SW datasheet(57/418 Pages) RENESAS

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HD6433637SW Datasheet(PDF) 57 Page - Renesas Technology Corp

Part #	HD6433637SW

Description	8-Bit Microcomputer

PDF	418 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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57 / 418 page

2.6.2

Access to On-Chip Peripheral Modules

On-chip peripheral modules are accessed in two states or three states. The data bus width is 8 bits,

so access is by byte size only. This means that for accessing word data, two instructions must be

used.

Two-state access to on-chip peripheral modules

Figure 2.12 shows operation timings for accessing on-chip peripheral modules in 2 states.

T1 state

Bus cycle

T2 state

ø or ø

Internal address bus

Internal read signal

Internal data bus

(read access)

Internal write signal

Read data

Address

Write data

Internal data bus

(write access)

SUB

Figure 2.12 On-Chip Peripheral Module Access Cycle (2-State Access)

Three-state access to on-chip peripheral modules

Figure 2.13 shows operation timings for accessing on-chip peripheral modules in 3 states.

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