SC73C1602Q-XXXG 查看數據表（PDF） - Silan Microelectronics
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SC73C1602Q-XXXG Datasheet PDF : 23 Pages
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FUNCTION DESCRIPTION
1. PC
PC refers to the program counter, 11 bits. The maximum addressing area is 2K ROM .The program counter
contains the address of the instruction that will be executed next. The PC value is cleared to 0 after reset. The PC
is set to predefined value when one of the 3 following occasions occurs: 1) when the JUMP instruction is
executed; 2) when a subroutine call is back; 3) when a program call is back. In the SC73C1602, all instructions
are one-byte OP Code instructions, so generally PC increments by 1 each time an instruction is executed.
2. MBR
Memory buffer register (MBR) is the write-only, higher 4-bit of the program pointer. The ROM of SC73C1602 can
be divided into 16 blocks. Each block has 128 bytes. These blocks can be addressed by the MBR. When the
program starts executing a branch instruction, it must load the corresponding value to the MBR register, and then
executes the command BSS label.
3. STACK
Stack register stores the previous value of program pointer during execution of subroutine calls, 11 bits. Because
there is two-level hardware stack registers, two-level programs can be called. When the user tries to make a
nested two-level program call, an error will occur.
4. B, H, D
Lower 3-bit of register B and all bits (4-bit) of H, D (ROM address is formed according to BHD order) are used as
pointers pointing to data table when accessing data in ROM whose space of 2K can be used for data table,
otherwise, register H, D act as general purpose register as others. Data lookup in ROM automatically whose 11-
bit address is decided by lower 3-bit of register B and all bits of register H & D, is available through corresponding
instructions.
5. ROM
Address
000H
001H
002H
01FH
020H
7FFH
2K x 9 bits
Subroutine call start address
Program address
or
Table data
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REV:2.5 2009.07.20
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