System Register FF30h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Register FF31h
8-16
SYM53C040 DATA MANUAL VERSION 2.0
PRELIMINARY
These read/write register bits determine if pulldowns are active on the I/O pins
MPIO3_0, MPIO3_1, MPIO3_2, and MPIO3_3. A value of 1 indicates the pulldown is
active, a value of 0 indicates the pulldown is inactive.
System Register FF30h
Multi-Purpose LED Bank 0L Output (MLO0L)
Read/write
MLO0L Bits 7-0 MLO0_3A, MLO0_3B, MLO0_2A, MLO0_2B, MLO0_1A, MLO0_1B,
MLO0_0A, MLO0_0Ba (Multi-purpose LED Bank 0L Output)
The bits in this registers control the Multi-Purpose LED Bank 0 pins MPLED0_3,
MPLED0_2, MPLED0_1, and MPLED0_0. Two bits are used to control each LED,
The slow blink and fast blink rates are defined in the LBR register FF02h. All LED pins
have 16 mA open-drain drivers. Turning the LED off (mlox_xa = 0 and mlox_xb = 0)
effectively tri-states the driver.
System Register FF31h
Multi-Purpose LED Bank 0H Output (MLO0H)
Read/write
Bits 7-0 MLO0_7A, MLO0_7B, MLO0_6A, MLO0_6B, MLO0_5A, MLO0_5B,
MLO0_4A, MLO0_4B (Multi-Purpose LED Bank 0H Output)
The bits in this register controls the Multi-Purpose LED Bank 0 pins MPLED0_7,
MPLED0_6, MPLED0_5, and MPLED0_4. Two bits are used to control each LED,
MLO0_3A
MLO0_3B
MLO0_2A
MLO0_2B
MLO0_1A
MLO0_1B
MLO0_0A
MLO0_0B
76543210
Defaults:
00000000
Table 8-5
LED behavior
MLOx_xA
MLOx_xB
LED behavior
00OFF
01slow blink
10fast blink
1
CONSTANT ON
MLO0_7A
MLO0_7B
MLO0_6A
MLO0_6B
MLO0_5A
MLO0_5B
MLO0_4A
MLO0_4B
76543210
Defaults:
00000000