5 / 23 page
Revision 1.2
- 5 -
24 October 2000
MTU8B54E/55E/56E/57E
MYSON
TECHNOLOGY
3.1.5 FSR(File select register pointer): R4
Bit 0~4 are used to select up to 32 registers (address: 00h~1Fh) and Bit 5~6 are Bank Select (Bank0~3) in the
indirect addressing mode shown in Figure 2.
3.1.6 PORT A: R5
PA3:PA0, bi-directional I/O Register
3.1.7 PORT B: R6
PB7:PB0, bi-directional I/O Register
3.1.8 PORT C: R7
PB7:PB0, bi-directional I/O Register, and for MTU8B55E/57E only
3.1.9 T0MODE REGISTER: T0MODE is a write-only register and the content is listed in Table 2.
3.1.10 IOST (Control Port I/O Mode Register)
The IOST register is “write-only”
= 0, I/O pin in output mode;
= 1, I/O pin in input mode.
Bank 3
Bank 2
Bank 1
B7
B6
B5
B4
B3
B2
B1
B0
Indirect Addressing Mode
Location Select
Read 1
Bank Select
FIGURE 2. Data Memory Configuraion
00h
INAR
01h
Timer0
02h
PC
03h
STATUS
04h
FSR
05h
PORT A
06h
PORT B
07h
PORT C
08h
8 Bytes
SRAM
0Fh
Bank 0
SRAM
16 Bytes
10h
1Fh
30h
3Fh
50h
5Fh
70h
7Fh
Bank 0
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
