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參數(shù)資料
| 型號(hào)： | UPD75237 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁(yè)數(shù)： | 28/191頁(yè) |
| 文件大?。?/td> | 1255K |
| 代理商： | UPD75237 |
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28
μ
PD75237
3.
INTERNAL CPU FUNCTIONS
3.1
PROGRAM COUNTER (PC): 15 BITS
This is a 15-bit binary counter to hold the program memory address information.
Fig. 3-1 Program Counter Configuration
When RESET is input, the lower 6 bits at address 0000H and the contents at address 0001H of the program
memory are set to PC13 to PC8 and PC7 to PC0, respectively, and the PC is initialized. The reset start address should
therefore be located in the 16K space (0000H to 3FFFH).
3.2
PROGRAM MEMORY (ROM): 24448 WORDS
×
8 BITS
This is a mask programmable ROM having a configuration of 24448 words
×
8 bits to store programs, table data,
etc.
The program memory is addressed by the program counter. Table data can be referred to by the table reference
instruction (MOVT).
The branch range enabled by the branch and subroutine call instructions is shown in Fig. 3-2. The entire space
branch instruction (BRA !addr1) and the entire space call instruction (CALLA !addr1) allow direct branching to the
entire space from 0000H to 5F7FH. The relative branch instruction (BR $addr) enables branch to the [PC contents
–15 to –1, +2 to +16] address irrespective of the block boundary.
The program memory addresses are 0000H to 5F7FH and the following addresses are especially assigned. (All
areas except 0000H and 0001H can be used as the normal program memory.)
Addresses 0000 and 0001H
Vector address table for writing the program start address to be set upon RESET input and the RBE and MBE
set values. Can be reset and started at any address in a 16K space (0000H to 3FFFH).
Addresses 0002 to 000FH
Vector address table for writing the program start address to be set by each vectored interrupt and the RBE
and MBE set values. Interrupt service can be started at any address in a 16K space (0000H to 3FFFH).
Addresses 0020 to 007FH
Table area to be referred to by GETI instruction
*
.
*
GETI instruction is an instruction to realize any 2-byte/3-byte instruction or two 1-byte instructions with one byte.
It is used to decrease the number of program bytes. (Refer to
8.1 CHARACTERISTIC INSTRUCTIONS OF
μ
PD75237
.)
PC14
PC13
PC12
PC11
PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
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