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| 型号： | EM78459 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC |
| 中文描述： | 8位微控制器的通用产品 |
| 文件页数： | 54/57页 |
| 文件大小： | 854K |
| 代理商： | EM78459 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
6
4. FUNCTION DESCRIPTION
DATA & CONTROL BUS
IOC5
R5
P
5
0
P
5
1
P
5
2
P
5
3
P
5
4
P
5
P
5
6
P
5
7
Comparators
8 ADC
2 PWMs
IOC6
R6
P
6
0
P
6
1
P
6
2
P
6
3
P
6
4
P
6
5
P
6
P
6
7
ACC
R3
STACK 0
STACK 1
STACK 2
STACK 3
STACK 4
P C
ROM
Instruction
Register
Instruction
Decoder
ALU
Interrupt
Control
/INT
R4
RAM
WDT Timer
Prescaler
Oscillator/
Timming
Control
WDT
Time-out
R1(TCC)
Sleep
&
Wake Up
Control
ENTCC
STACK 5
STACK 6
STACK 7
Fig. 2 The Functional Block Diagram of EM78458/459
4.1 Operational Registers
1. R0 (Indirect Addressing Register)
R0 is not a physically implemented register. Its major function is to perform as an indirect addressing
pointer. Any instruction using R0 as a pointer, actually accesses data pointed by the RAM Select
Register (R4).
2. R1 (Time Clock /Counter)
Increased by an external signal edge through the TCC pin, or by the instruction cycle clock.
The signals to increase the counter are decided by Bit 4 and Bit 5 of the CONT register.
Writable and readable as any other registers.
3. R2 (Program Counter) & Stack
R2 and hardware stacks are 12-bit wide. The structure is depicted in Fig. 4.
Generates 4K
×13 bits on-chip ROM addresses to the relative programming instruction codes. One
program page is 1024 words long.
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