PM Registers

Register Overview

The Pokemon Mini maps $2000 ~ $20FF as hardware control registers. This area is reserved for hardware related functions such as video, audio, general purpose timers, hardware I/O and system control.

Much of this address space is mapped as Open Bus, leading us to beleive that this area is not used for any purpose. Other areas respond to requests but their purpose is yet undetermined.

Registers tend to be controlled on a bit level, so for the sanity purposes, they will be broken down to this level. At any point they are shown spanning multiple columns, that indicates that it is a multi-bit value and should be treated as if they were a number.

The bits themselves come in four flavors: Read-only, Write-Only, Read-Write, and S-R Strobe. Write-Only registers typically return a zero value, and are generally only used for things such as resetting timers. S-R Strobes are used for clearing interrupt events. Writting a logical '1' to any bit that is set will result in a bit being cleared, where as '0' leaves them unchanged.

Any register not included on this list reads as Open-Bus and will be excluded unless a function has otherwise been determined.

Register Mapping

Address	Register	Const Name	7	6	5	4	3	2	1	0
$00	System Control 1	SYS_CTL1	Startup Contrast						Unknown	Unknown
$01
$02
$08
$09
$0A
$0B
$10
$18
$19
$1A
$1B
$1C
$1D
$20
$21
$22
$23
$24
$25
$26
$27
$28
$29
$2A
$30
$31
$32	Timer 1 Preset (Lo)	TIM1_PRE_L	Preset
$33	Timer 1 Preset (Hi)	TIM1_PRE_H	Preset
$34	Timer 1 Pivot (Lo)	TIM1_PVT_L	Pivot
$35	Timer 1 Pivot (Hi)	TIM1_PVT_H	Pivot
$36	Timer 1 Count (Lo)	TIM1_CNT_L	Count
$37	Timer 1 Count (Hi)	TIM1_CNT_H	Count
$38
$39
$3A	Timer 2 Preset (Lo)	TIM2_PRE_L	Preset
$3B	Timer 2 Preset (Hi)	TIM2_PRE_H	Preset
$3C	Timer 2 Pivot (Lo)	TIM2_PVT_L	Pivot
$3D	Timer 2 Pivot (Hi)	TIM2_PVT_H	Pivot
$3E	Timer 2 Count (Lo)	TIM2_CNT_L	Count
$3F	Timer 2 Count (Hi)	TIM2_CNT_H	Count
$40
$41
$44
$45
$46
$47
$48
$49
$4A	Timer 3 Preset (Lo)	TIM3_PRE_L	Preset
$4B	Timer 3 Preset (Hi)	TIM3_PRE_H	Preset
$4C	Timer 3 Pivot (Lo)	TIM3_PVT_L	Pivot
$4D	Timer 3 Pivot (Hi)	TIM3_PVT_H	Pivot
$4E	Timer 3 Count (Lo)	TIM3_CNT_L	Count
$4F	Timer 3 Count (Hi)	TIM3_CNT_H	Count
$50
$51
$52	Key-Pad Status (Active 0)	KEY_PAD	Power	Right	Left	Down	Up	C	B	A
$53
$54
$55
$60
$61
$62
$70
$71
$80
$81
$82
$83
$84
$85
$86
$87
$88
$89
$8A
$8B	Unknown (returns 0)
$8C	Unknown (returns 0)
$8D	Unknown (returns 0)
$8E	Unknown (returns 0)
$8F	Unknown (returns 0)
$F0	Unknown (returns 0)
$F1	Unknown (returns 0)
$F2	Unknown (returns 0)
$F3	Unknown (returns 0)
$F4	Unknown (returns 0)
$F5	Unknown (returns 0)
$F6	Unknown (returns 0)
$F7	Unknown (returns 0)
$FE	LCD Raw Control Byte	LCD_CTRL	LCD Control I/O
$FF	LCD Raw Data Byte	LCD_DATA	LCD Data I/O