8051 Series issues
Can I tied SS pin to Ground, just use 3 pins for SPI interface?
Yes, but we don＊t recommend to do in this way, because SS pin is select device, when SS pin is Low, means always ready to use SPI interface, therefore you need make sure other 3 pins not have data, or may will have some mistake happen.
What is P1~P4 pull up resistance in 89 series MCU?
P1~P4 pull up resistance is about 47K in 89 series MCU, and 82 series MCU pull up resistance show as below:
| I/O Mode | L(3.3V) type | E(5V) type |
| Quasi-bidirectional | 14K | 11.8K |
| Push-Pull output | 112.5 | 130 |
| Input Only | X | X |
| Open-Drain Output | X | X |
What＊s the power consumption of Megawin 8051 ICs?
The various power consumptions by different modes and types are listed as below:
| IC Type | Normal Mode | Idle Mode | Power Down Mode | ||
| 10MHz ~ 64MHz | 10MHz ~ 64MHz | ||||
| 89 series (E type) | 9.5mA ~ 26.24mA | 5.43mA ~ 21.32mA | 0.6uA ~ 0.64uA | ||
| 89 series (L type) | 6.26mA ~ 15.02mA | 2.5mA ~ 8.17mA | 0.41uA ~ 0.45uA | ||
| 2MHz ~ 24MHz | 2MHz ~ 24MHz | ||||
| 82x52 (E type) | 5.9mA ~ 15.4mA | Idle0 | 2.2mA ~ 7.1mA | < 0.1uA | |
| Idle7 | 1.8mA ~ 4.7mA | ||||
| 82x52 (L type) | 4.9mA ~ 12.8mA | Idle0 | 1.4mA ~ 4.6mA | < 0.1uA | |
| Idle7 | 1.3mA ~ 2.3mA | ||||
| 82x54 (E type) | 5.43mA ~ 15.44mA | Idle0 | 1.93mA ~ 7.04mA | < 0.1uA | |
| Idle7 | 1.65mA ~ 4.42mA | ||||
| 82x54 (L type) | 5.5mA ~ 14.61mA | Idle0 | 1.56mA ~ 5.09mA | < 0.1uA | |
| Idle7 | 1.29mA ~ 2.33mA | ||||
| 82G516 (2.4V) | 2.39mA ~ 11.74mA | Idle0 | 0.99mA ~ 5.03mA | Pwdn0 | < 0.19uA or < 0.5uA |
| Idle7 | 0.51mA ~ 1.10mA | Pwdn1 | < 0.05uA | ||
| 82G516 (3.6V) | 4.9mA ~ 22.2mA | Idle0 | 1.69mA ~ 9.07mA | Pwdn0 | < 1uA |
| Idle7 | 1.22mA ~ 2.54mA | Pwdn1 | <0.4uA | ||
| 82G516 (5.5V) | 5.77mA ~ 20.45mA | Idle0 | 2.48mA ~ 10.58mA | <1.95 | |
| Idle7 | 2.0mA ~ 5.25mA | ||||
| 12MHz | 12MHz | ||||
| MG84FL54B (Vdd_IO=5V) | 12mA ~ 18mA | 6mA ~ 9mA | 0.1 ~ 10uA | ||
| MG84FL54B (Vdd_IO=3.3V) | 9mA ~ 14.5mA | 3.5mA ~ 5.3mA | 0.1 ~ 10uA | ||
| MG87FE52 (5V) | 10mA ~ 20mA | 5mA ~ 10mA | 0.1 ~ 10uA | ||
| MG87FL52 (3.3V) | 7mA ~ 15mA | 2.5mA ~ 5mA | 0.1 ~ 5uA | ||
How much the sinking current is at the pins of P1~P4 by using 89 series MCU?
It＊s about 2.5 ~ 4 mA. Please refer to the DC Characteristics of data sheet for more details.
What is default address of AP, IAP and ISP of Megawin ICs factory standard setting?
The default setting is summarized as below:
| ITEM | AP Address | IAP Address | ISP Address |
| MPC89x51 | 0x0000 ~ 0x0FFF(4KB) | 0x1000 ~ 0x37FF(10KB) | 0x3800 ~ 0x3BFF(1KB) |
| MPC89x52 | 0x0000 ~ 0x1FFF(8KB) | 0x2000 ~ 0x37FF(6KB) | 0x3800 ~ 0x3BFF(1KB) |
| MPC89x53 | 0x0000 ~ 0x37FF(14KB) | Non | 0x3800 ~ 0x3BFF(1KB) |
| MPC89x54 | 0x0000 ~ 0x3FFF(16KB) | 0x4000 ~ 0xF7FF(46KB) | 0xF800 ~ 0xFBFF(1KB) |
| MPC89x58 | 0x0000 ~ 0x7FFF(32KB) | 0x8000 ~ 0xF7FF(30KB) | 0xF800 ~ 0xFBFF(1KB) |
| MPC89x515 | 0x0000 ~ 0xF7FF(62KB) | Non | 0xF800 ~ 0xFBFF(1KB) |
| MPC82x52 | 0x0000 ~ 0x17FF(6KB) | 0x1800 ~ 0x1BFF(1KB) | 0x1C00 ~ 0x1FFF(1KB) |
| MPC82x54 | 0x0000 ~ 0x33FF(13KB) | 0x3400 ~ 0x37FF(1KB) | 0x3800 ~ 0x3DFF(1.5KB) |
| MPC82G516 | 0x0000 ~ 0xEFFF(60KB) | 0xF000 ~ 0xFBFF(3KB) | 0xFC00 ~ 0xFFFF(1KB) |
| MG84FL54 | 0x0000 ~ 0x33FF(13KB) | 0x3400 ~ 0x37FF(1KB) | 0x3800 ~ 0x3FFF(2KB) |
| MG87FL(E)52 | Configure by software. (AP & IAP share 7K) | 0x1C00 ~ 0x1FFF(1KB) | |
| MG87FL(E)2051 | 0x0000 ~ 0x07FF(2KB) | Configure by software | 0x1C00 ~ 0x1FFF(1KB) |
| MG87FL(E)4051 | 0x0000 ~ 0x0FFF(4KB) | Configure by software | 0x1C00 ~ 0x1FFF(1KB) |
| MG87FL(E)6051 | 0x0000 ~ 0x17FF(6KB) | Configure by software. | 0x1C00 ~ 0x1FFF(1KB) |
How much MIPS in Megawin＊s MCU?
MIPS is Million Instructions Per Second , means every second can run how many instructions.
In 89 series MCU and use 12MHz Crystal, MIPS is:
1/12MHz * 12 * 1M = 1 (1/12MHz is a machine cycle, one instruction need 12 machine cycle)
Therefore Megawin＊s MCU can run 1M instruction in 1 second, but Megawin＊s MCU can set in 6T mode.(one instruction need 6 machine cycle)
So we can get result in Table 1.
If we use 82 series of Megawin＊s MCU, therefore 82 series MCU every instruction need different machine cycle,
So we use average 3T, and we can get Table 2.
Therefore we can get result is the max speed in 89 series is 4 MIPS, 82 series is 8 MIPS.
Table 1:
| Megawin 89 series MCUL(3.3V) typeE(5V) type | ||
| MCU Mode Crystal | 6T | 12T |
| 6MHz | 1 MIPS | 0.5 MIPS |
| 12MHz | 2 MIPS | 1 MIPS |
| 24MHz | 4 MIPS | 2 MIPS |
| 48MHz | x | 4 MIPS |
Table 2:
| Megawin 82 series MCUL(3.3V) typeE(5V) type | |||
| Crystal | 6MHz | 12MHz | 24MHz |
| MIPS | 2 MIPS | 4 MIPS | 8 MIPS |
Can I access to Option Register when running the program?
No, you can＊t access to Option Register when running the program.
How do you read the device ID of Megawin 8051 IC and what＊s the ID of each IC?
When IFADRL is set as 1, you may read the High Byte ID from SCMD, whereas you read the Low Byte ID when IFADRL is set as 0.
Device ID List and How to check Megawin IC Sample Code:
| IC Part number | MSB(High Byte) | LSB(Low Byte) |
| MPC89x51 | 0xF0 | 0x01 |
| MPC89x52 | 0xF0 | 0x02 |
| MPC89x53 | 0xF0 | 0x04 |
| MPC89x54 | 0xF1 | 0x04 |
| MPC89x58 | 0xF1 | 0x08 |
| MPC89x515 | 0xF1 | 0x10 |
| MPC82x52 | 0xF2 | 0x02 |
| MPC82x54 | 0xF3 | 0x04 |
| MPC82G516 | 0xF4 | 0x10 |
char check_is_MPC82G516()
{
IFADRL = 0;
If(SCMD != 0x10)
Return FAIL;
IFADRL = 1;
If(SCMD != 0xf4)
Return FAIL;
Return SUCCESS;
}
The second DPTR have any restrict when use it?
The second DPTR only support MOVX.
