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47C101P

CMOS 4-bit Microcontroller

Toshiba 

TMP47C101/201

Figure 2-3. Program Memory Map

2.3 H Register and L Register

The H register and L register are 4-bit general registers. They

are also used as a register pair (HL) for the data memory (RAM)

addressing pointer. The RAM consists of pages, each page

being 16 words long (1 word = 4 bits). The H register specifies

a page and the L register specifies an address in the page.

The L register has the auto-post-increment/decrement

capability, implementing the execution of composite instruc-

tions. For example, [ST A, @HL+] instruction automatically in-

crements the contents of the L register after data transfer.

During the execution of [SET @L], [CLR @L], or [TEST @L]

instructions, the L register is also used to specify the bits cor-

responding to I/O port pins R73 through R40 (the indirect ad-

dressing of port bits by the L register).

Example: To Write immediate values “5” and FH” to data

memory addresses 10H and 11H.

LD HL, #10H ; HL 10H

ST #5,@HL+ ; RAM [10H] 5H, LR←LR + 1

ST #0FH,@HL+ ; RAM [11H] FH, LR←LR + 1

Figure 2-4. Configuration of H and L Registers

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