84PCE:Ports:7000 - Revision history

MateoConLechuga: /* Registers */

2015-12-22T01:20:34Z

‎Registers

Dr. D'nar: Do we like tables? I like tables, leave a comment if you don't.

2015-04-04T17:04:39Z

Do we like tables? I like tables, leave a comment if you don't.

Calc84maniac: Updated with full documentation

2015-04-04T06:38:06Z

Updated with full documentation

Dr. D'nar at 22:58, 30 March 2015

2015-03-30T22:58:14Z

Dr. D'nar: Created page with "7000 - Another Timer Another Timer == Synopsis == '''Port Number:''' 7000-? '''Function:''' Another timer..."

2015-03-27T21:15:30Z

Created page with "7000 - Another Timer Another Timer == Synopsis == '''Port Number:''' 7000-? '''Function:''' Another timer..."

New page

[[Category:84PCE:Ports:By_Address|7000 - Another Timer]] [[Category:84PCE:Ports:By_Name|Another Timer]]
== Synopsis ==
'''Port Number:''' 7000-?

'''Function:''' Another timer

This range appears to provide another timer that runs when USB is connected. It probably has other functions.

@@ Line 29: / Line 29: @@
 |7004<br/>F20004
 |7014<br/>F20014
-|7014<br/>F20024
+|7024<br/>F20024
 |32-bit<br/>R/W
 |Reset value&nbsp;&nbsp;&nbsp;
@@ Line 36: / Line 36: @@
 |7008<br/>F20008
 |7018<br/>F20018
-|7018<br/>F20028
+|7028<br/>F20028
 |32-bit<br/>R/W
 |Match value 1&nbsp;&nbsp;&nbsp;
@@ Line 43: / Line 43: @@
 |700C<br/>F2000C
 |701C<br/>F2001C
-|701C<br/>F2002C
+|702C<br/>F2002C
 |32-bit<br/>R/W
 |Match value 2&nbsp;&nbsp;&nbsp;

@@ Line 11: / Line 11: @@
 == Registers ==
 All registers are little-endian and cross multiple 8-bit ports.
-* Timers 1, 2, 3:
-** 7000, 7010, 7020 (R/W):
+{|-
-*** 32-bit counter register. Can be written directly, but it should be disabled first since the entire value cannot be written atomically.
+|<u>Timer 1</u>&nbsp;&nbsp;&nbsp;
-** 7004, 7014, 7024 (R/W):
+|<u>Timer 2</u>&nbsp;&nbsp;&nbsp;
-*** 32-bit reload register. The counter is reloaded with this value once it reaches 0.
+|<u>Timer 3</u>&nbsp;&nbsp;&nbsp;
-** 7008, 7018, 7028 (R/W):
+|<u>Bits, R/W?</u>&nbsp;&nbsp;&nbsp;
-*** 32-bit match register 1. An interrupt will be generated when the counter matches this value.
+|<u>Purpose</u>&nbsp;&nbsp;&nbsp;
-** 700C, 701C, 702C (R/W):
+|<u>Description</u>&nbsp;&nbsp;&nbsp;
-*** 32-bit match register 2. An interrupt will be generated when the counter matches this value.
+|-
-** 7030 (R/W): 12-bit control register.
+|7000<br/>F20000
-*** Bits 0,3,6: Timer enable. Set to enable the corresponding timer.
+|7010<br/>F20010
-*** Bits 1,4,7: Clock source. Set to 1 to use the 32768Hz clock, or 0 to use the CPU clock.
+|7020<br/>F20020
-*** Bits 2,5,8: Overflow interrupt enable. Set to generate an interrupt when the counter reaches 0.
+|32-bit<br/>R/W
-*** Bits 9,10,11: Count direction. Set to 1 to count up, or 0 to count down.
+|Counter register&nbsp;&nbsp;&nbsp;
-** 7034 (R/W): 12-bit interrupt status register. Reads the cause of the interrupt. Write 1 bits to reset.
+|Can be written directly, but it should be disabled first since the entire value cannot be written atomically.
-*** Bits 0,3,6: Match 1. Set after the counter reaches match register 1.
+|-
-*** Bits 1,4,7: Match 2. Set after the counter reaches match register 2.
+|7004<br/>F20004
-*** Bits 2,5,8: Overflow. Set after the counter reaches 0 and gets reloaded, but only if enabled in the control register.
+|7014<br/>F20014
-** 7038 (R/W): 12-bit interrupt mask? Seems to have no effect on interrupt generation, however.
+|7014<br/>F20024
-** 703C (R):
+|32-bit<br/>R/W
-*** 32-bit revision register. Reads a constant 0x00010801, which corresponds to revision 1.8.1.
+|Reset value&nbsp;&nbsp;&nbsp;

@@ Line 1: / Line 1: @@
-[[Category:84PCE:Ports:By_Address|7000 - Another Timer]] [[Category:84PCE:Ports:By_Name|Another Timer]]
+[[Category:84PCE:Ports:By_Address|7000 - General-Purpose Timers]] [[Category:84PCE:Ports:By_Name|General-Purpose Timers]]
 == Synopsis ==
-'''Port Number:''' 7000-?
+'''Port Number:''' 7000-703F
 '''Memory-mapped address:''' F20000
-'''Function:''' Another timer
+'''Function:''' General-Purpose Timers
-This range appears to provide another timer that runs when USB is connected. It probably has other functions.
+This range provides three general-purpose 32-bit timers (appears to be model FTTMR010). They can count up or down, and run at either 32768Hz or the CPU clock speed. The counters can generate interrupts either when looping or when matching one of two customizable values. The OS uses the third timer when USB is connected.